-is¹

Meaning

1. femininemorpheme-id (female equivalent or descendant)
   Masculine equivalent: -idēs m
2. femininemorpheme-id (epic poem)
3. femininemorpheme-id (meteor)

Origins

Pre-Greekder. Ancient Greek -ῐς (-ĭs)bor. Latin -is Borrowed from Ancient Greek -ῐς (-ĭs).

Meaning

1. morphemesuffixtwo terminationderives compound adjectives with the sense "having (noun)"
   tri- + annus + -is → triennis
   bi- + penna + -is → bipennis

Origins

From Proto-Italic *-is, possibly in part from reanalysis of Proto-Indo-European *-ih₂ (originally a suffix used to form feminine nouns). According to Sihler 1995, it is unclear to what extent i-stem adjectives were common in Proto-Indo-European; they are relatively rare in Greek and Indo-Iranian, but may have been lost as a shared innovation of these branches.