List of words that may be spelled with a ligature

This list of words that may be spelled with a ligature in English encompasses words which have letters that may, in modern usage, either be rendered as two distinct letters or as a single, combined letter. This includes AE being rendered as Æ and OE being rendered as Œ.

Until the early twentieth century, the œ and æ ligatures had been commonly used to indicate an etymological connection with Latin or Greek. Since then they have fallen out of fashion almost completely and are now only used occasionally. They are more commonly used for the names of historical people, to evoke archaism, or in literal quotations of historical sources. These ligatures are proper letters in some Scandinavian languages, and so are used to render names from those languages, and likewise names from Old English. Some American spellings replace ligatured vowels with a single letter; for example, gynæcology or gynaecology is spelled gynecology.

The fl and fi ligatures, among others, are still commonly used to render modern text in fine typography. Page-layout programs such as QuarkXPress and Adobe InDesign can be configured to automatically replace the individual characters with the appropriate ligatures. However this is a typographic feature and not part of the spelling.

Æ

Note that some words contain an ae which may not be written æ because the etymology is not from the Greek -αι- or Latin -ae- diphthongs. These include:

  • In instances of aer (starting or within a word) when it makes the sound IPA [ɛə]/[eə] (air). Comes from the Latin āër, Greek ἀήρ.
  • When ae makes the diphthong // (lay) or // (eye).
  • When ae is found in a foreign phrase or loan word and it is unacceptable to use the ligature in that language. For example, when in a German loan word or phrase, if the a with an umlaut (ä) is written as ae, it is incorrect to write it with the ligature.
Non-ligature formLigature formOther formsEtymology
acanthaesthesiaacanthæsthesiaacanthesthesiaFrom Ancient Greek ἄκανθα (ákantha, “thorn”) + αἴσθησις (aísthēsis, “sensation”)
AchaeanAchæanAchean, Achaian, AkhaianFrom Latin Achaeus or Achaius, from Ancient Greek Ἀχαιός (Akhaiós)
AeaeaÆæaEëäFrom Greek Αἰαία (Aiaíā)
aeciosporeæciosporeaeciosporeNew Latin aecium from Ancient Greek αἰκία (aikía, “injury, insult”) and New Latin spora from Ancient Greek σπορά (sporá, “seed, a sowing”)
aecidiumæcidium(aecidium)New Latin aecidium, from Greek αἰκία (aikia)
aeciumæcium(aecium)New Latin aecidium, from Greek αἰκία (aikia)
aediculeædiculeedicule (AmE)From Latin aedicula (“small house”), diminutive of aedis (“a house”)
AegisÆgisEgis (archaic in AmE)Latin from Greek Αἰγίς (Aigis)
Aegyptus Ægyptus Egyptus (Biblical) Latin from Greek Αἴγυπτος (Aígyptos)
AelfredÆlfredAlfredOld English—see Alfred
AeolianÆolianEolian (AmE)Latin Aeolis from Greek mythology Αἰολίς (Aiolis)
AeolisÆolisLatin Aeolis, from Greek Αἰολίς (Aiolis)
aeonæoneon (AmE)Late Latin aeon, from Greek αἰών (aion).
aeraæraera (AmE)
aerugiteærugite(aerugo)Latin aerugo, from aes
aerugoærugo(aerugite)Latin aerugo, from aes
aeschyniteæschyniteeschynite (AmE)Greek αἰσχύνω (aischuno)
aesculinæsculinesculin (AmE)
aesculetinæsculetinesculetin (AmE)
AesopÆsopEsopAncient Greek Αἴσωπος (Aisōpos)
aestheticæstheticesthetic (AmE - rare)Greek αἰσθετικός (aisthetikos)
aestivalæstivalestival (AmE)Latin aestivus, from aestas
aestivationæstivationestivation (AmE)Latin aestivare, from aestivus, from aestas
AetherÆtherether (AmE)Latin aether, from Greek αἰθήρ (aither)
aetherealæthereal or ætherialethereal (AmE), ethereal (AmE - rare), aetherial (BrE - rare)
AethelthrythÆthelthrythAudreyAnglo-Saxon
AethrioscopeÆthrioscopeEthrioscopeGreek αἴθριον (aithrion)
aetiologyætiologyetiology (AmE)
algaealgæalgas (very rare)
AlphaeusAlphæus
ambilevousambilævousFrom Latin ambilævus (ambi- ("both") + lævus ("left")), a calque of Ancient Greek ἀμφαρίστερος (ampharisteros).
anaemiaanæmiaanemia (AmE)
anaesthesiaanæsthesiaanesthesia (AmE)
anapaestanapæstanapest (AmE)
antennaeantennæantennas
archaeologyarchæologyarcheology (AmE)
archaebacteria archæbacteria archaea/archæ
AthenaeumAthenæumAtheneum (AmE)
azotaemiaazotæmiaazotemia (AmE)
bacteraemiabacteræmiabacteremia (AmE)
CaedmonCædmonCadmon
CaesarCæsarCesar (AmE  rare)
caesiumcæsiumcesium (AmE)
ChaldaeaChaldæaChaldea
chaetophorouschætophorouschetophorous
chimaerachimærachimera (AmE)
coaevalcoævalcoeval
curriculum vitaecurriculum vitæLatin meaning ‘course of life’, vitæ
cyclopaediacyclopædiacyclopedia
daedaldædaldedal
daemondæmondemonGreek: δαιμων (daimon)
diaeresisdiæresisdieresis (AmE)
EgyptÆgyptAegypt (Archaic)From the Latinised Ægyptus
encyclopaediaencyclopædiaencyclopedia (AmE)
enigmaænigmaaenigma
EpaenetusEpænetus
eraæraaera (BrE - rare)Late Latin aera, probably from Latin æs (plural æra)
et ceteraet cæteraet caetera, etc., &c.Latin phrase
eternalæternalaeternal
EthiopiaÆthiopiaAethiopia
Eudaemoniceudæmoniceudemonic
faecesfæcesfeces (AmE)
fairyfæriefaerie
formulaeformulæformulas
fraenumfrænumFrenum
GaeaGæaGaia
Graeco-RomanGræco-RomanGreco-Roman (AmE)
haemoglobinhæmoglobinhemoglobin (AmE)
haemolysishæmolysishemolysis (AmE)
haemophiliahæmophiliahemophilia (AmE)
haemorrhagehæmorrhagehemorrhage (AmE)
haemorrhoidhæmorrhoidhemorrhoid (AmE)
hyaenahyænahyena
HymenaeusHymenæus
hypaethralhypæthralhypethral
hyperbolaehyperbolæhyperbolas (AmE)
hypnopediahypnopædia
IdumaeaIdumæaIdumeaFrom "Edom" (Esau).
IrenaeusIrenæus
ischaemiaischæmiaischemia (AmE)
IturaeaIturæaIturea
Judaeo-Judæo-Judeo-
judaeophobejudæophobejudeophobe (AmE)
leukaemialeukæmialeukemia (AmE)
medievalmediævalmediaeval (BrE)
nebulaenebulænebulasplural – New LatinLatin ("mist"); akin to Old High German nebul ("fog") → Greek nephelē, nephos ("cloud")
nymphaenymphænymphs
nymphaeanymphæa
orthopaedicorthopædicorthopedic (AmE)
paeanpæanpean (AmE)
paeonpæon
pedagoguepædagogue or pædagogpedagog (AmE), (paedagogue and paedagog exist but are both somewhat archaic)
pederastypæderastypaederasty
paediatricspædiatricspediatrics (AmE)
paediatricianpædiatricianpediatrician (AmE)
paediatristpædiatristpediatrist (AmE)
paedophilepædophilepedophile (AmE)
palaeobotanypalæobotanypaleobotany (AmE)
palaeocenepalæocenepaleocene (AmE)
palaeoclimatologypalæoclimatologypaleoclimatology (AmE)
palaeographypalæographypalaeography (AmE)
palaeolithicpalæolithicpaleolithic (AmE)
palaeographypalæographypaleography (AmE)
palaeontologypalæontologypaleontology (AmE)
palaeozoicpalæozoicpaleozoic (AmE)
PanacaeaPanacæaPanacea (AmE)
pandemoniumpandæmoniumpandaemonium
PangaeaPangæaPangea (AmE)
parabolaeparabolæparabolas (AmE)
personaepersonæpersonas
Plantae Plantæ
premiumpræmiumpraemium
pretoriumprætoriumpraetorium, also prœtoriumBoth forms with æ and œ seen, from Latin, praetōrium
Primevalprimævalprimaeval (BrE - rare)
QuaestorQuæstor
RhaetiaRhætia
septicaemiasepticæmiasepticemia (AmE)
scarabaeidscarabæid
scarabaeoidscarabæoid
subpoenaesubpœnæ
supernovaesupernovæsupernovas
synaeresissynæresissyneresis (AmE)
synaesthesiasynæsthesiasynesthesia (AmE)
ThaddaeusThaddæusThaddeus
toxaemiatoxæmiatoxemia (AmE)
uraemiauræmiauremia (AmE)
vertebraevertebræ
viraemiaviræmiaviremia (AmE)
ZacchaeusZacchæusZaccheus
zoogloeaezoöglœæ

Œ

Common formLigature formOther formsEtymology
amenorrhoeaamenorrhœaamenorrhea (AmE)From Greek α (a) + μένόρροια (mēnorroia)
amoebaamœbaameba (AmErare)New Latin amoeba, from Greek ἀμοιβή (amoibē)
apneaapnœaapnoea (BrE)New Latin apnoea, from Greek απνοια (apnoia)
coelacanthcœlacanthFrom Greek κοῖλος (koîlos, “hollow”) + ἄκανθα (ákantha, “spine”)
coeliaccœliacceliac (AmE)Latin coeliacus, from Greek κοιλιακος (koiliakos)
coeptis cœptis On the Great Seal of the United States, Annuit cœptis from Latin, coeptum.
Confoederatio Helvetica Confœderatio Helvetica Latin for "Helvetic Confederation". The Roman and now formal name for Switzerland. The abbreviation CH is derived from the initialization of this Latin phrase.
diarrhoeadiarrhœadiarrhea (AmE)Middle English diaria, from Late Latin diarrhoea, from Greek διάρροια (diarroia)
dyspneadyspnœadyspnoea
ecologyœcologyoecology
economicsœconomicsoeconomics
economyœconomyoeconomy
ecumenismœcumenismoecumenism, rarely ocumenism
esophagusœsophagusoesophagus (BrE)
estrogenœstrogenoestrogen (BrE)
estrusœstrusoestrus
federalfœderalfoederal  archaic; thus virtually never foundLatin foedus
fetidfœtidfoetid (BrE)Latin fētidus
fetorfœtorfoetor (BrE)Middle English fetoure, from Latin fētor
fetusfœtusfoetus (BrE)Middle English fetus, from Latin fētus
gonorrhoeagonorrhœagonorrhea (AmE)Greek γονόρροια (gonorrhoia)
homeomorphismhomœomorphismhomoeomorphism (BrE)From Greek ὅμοιος (homoios) + μορφος (morphos)
homeopathhomœopathhomoeopath (BrE)From Greek ὅμοιος (homoios) + πάθος (pathos)
homeostasishomœostasishomoeostasis (BrE)From Greek ὅμοιος (homoios) + στάσις (stasis)
homoeozoichomœozoichomeozoic (AmErare)From Greek ὅμοιος (homoios) + ζωικός (zōikos)
hors d'oeuvrehors d'œuvreFrench hors d'œuvre
logorrhoealogorrhœalogorrhea (AmE)From Greek
maneuvermanœuvremanoeuvre (BrE)French manœuvre, from Old French maneuvre, from Medieval Latin manuopera, from Latin manū operārī
oedemaœdemaedema (AmE)
OedipusŒdipusOidipous, Oidipus (both rare)Greek Οἰδίπους (Oidipous)
oeilladeœillade
oenologyœnologyenology (AmE)From Greek οίνος (oinos) + λόγος (logos)
oenomelœnomel
oenotheraœnothera
oesophagusœsophagusesophagus (AmE)
oestrusœstrusestrus (AmE)Greek οἶστρος (oistros) ‘gadfly or frenzy’
OethelwaldŒthelwaldŒthelwald of Deira
oeuvreœuvreFrench œuvre, from Old French uevre, from Latin opera
onomatopoeiaonomatopœia
penologypœnology
PhoebePhœbe
phoenixphœnixphenix (rare)
pretoriumprœtoriumprætorium or praetoriumBoth forms with œ and æ seen, from Latin, praetōrium.
subpoenasubpœnasubpena (rare)
tragedytragœdytragoedy
zoogloeazoöglœa-

Notes

  1. ^ ^ ^ ^ ^ ^ ^ ^ ^ The variants that change '-æ' or '-œ' to '-s' are not variants in spelling, but the same meaning of the word with a different way of forming plurals.
  2. ^ "caesium" (see article) is preferred by the IUPAC.

Also, ligatures may be used in personal names as well, i.e. Maecenus as Mæcenus etc.

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