deirfiúr

• deirbhshiúr (obsolete)
• driofúr (nonstandard)

From Old Irish derbṡiur, from derb (“certain”) +‎ siur (“sister”), from Proto-Celtic *swesūr, from Proto-Indo-European *swésōr.

• (Cork, Kerry) IPA^(key): /dʲɾʲəˈfˠuːɾˠ/ (as if spelled driofúr)
• (Muskerry) IPA^(key): /dʲɾʲəˈfʲuːɾˠ/ (as if spelled drifiúr, only some speakers)
• (Ring) IPA^(key): /dʲɛɾʲəˈfˠuːɾˠ/ (as if spelled deiriofúr)
• (Aran) IPA^(key): /ˈdʲɾʲauhəɾˠ/ (as if spelled dreabhthar)
• (Cois Fhairrge) IPA^(key): /ˈdʲɾʲauɾˠ/ (as if spelled dreabhthar)
• (West Connemara, South Mayo) IPA^(key): /ˈdʲɾʲɛhuːɾˠ/ (as if spelled dreithiúr)
• (Achill) IPA^(key): /ˈdʲɛɾʲəfʲəɾˠ/ (as if spelled deirfear)
• (Erris) IPA^(key): /ˈdʲɛɾʲəhuːɾˠ/ (as if spelled deirthiúr)
• (Ulster) IPA^(key): /ˈdʲɛɾʲəfʲaɾˠ/, /ˈdʲɛɾʲəfʲəɾˠ/ (as if spelled deirfeár or deirfear)

deirfiúr f (genitive singular deirféar, nominative plural deirfiúracha)

1. sister

• deartháir

• deirfiúirín m (“heath milkwort”)

• siúr

• "deirfiúr" in Foclóir Gaeilge-Béarla, An Gúm, 1977, by Niall Ó Dónaill.
• “derbsiur” in Dictionary of the Irish Language, Royal Irish Academy, 1913–76.