-anus

• -ēnus, -iānus, -īnus, -ūnus

From some -ā- stem + -nus; later interpreted as one whole suffix and used freely.

• (Classical) IPA^(key): /ˈaː.nus/, [ˈaː.nʊs]
• (Ecclesiastical) IPA^(key): /ˈa.nus/, [ˈaː.nus]

-ānus m (feminine -āna, neuter -ānum); first/second declension

1. Of or pertaining to; -ian; usually indicates a relationship of position, possession, or origin.

The suffix -ānus is added to a noun stem (particularly proper nouns) to form an adjective.

Examples:

mōns (“mountain”) → montānus (“montane, of the mountains”)

pāgus (“village”) → pāgānus (“rustic, of a village”)

Rōma (“Rome”) → rōmānus (“Roman”)

Christus (“Christ”) → christiānus (“christian”)

It is frequently preceded by the noun stem followed by -i- except in the case of Latin nouns (typically borrowed from Greek) ending -e- or -ae-, where it is preceded by -e- instead.

First/second declension.

• -ēnsis, -icus