-εῖος

See also: -ειος and εἷος

Ancient Greek

Partially from a union of a stem vowel ε and -ιος (-ios), usually from stems in -εύς (-eús) (originally *-ηϝ-, whence the Ionic diaeresis), and sometimes applied to other stems.
Partially from -εῖϝος, from Proto-Indo-European *-iHwós, an extended form of *-wós. Note the double Latin adoption -īvus (e.g. Argīvus) and -ēus (e.g. mūsēum). Cognate with Latin -īvus.

-εῖος • (-eîos) m (feminine -είᾱ, neuter -εῖον); first/second declension

First and second declension of -εῖος; -είᾱ; -εῖον (Attic)

Number	Singular			Dual			Plural
Case/Gender	Masculine	Feminine	Neuter	Masculine	Feminine	Neuter	Masculine	Feminine	Neuter
Nominative	-εῖος -eîos	-είᾱ -eíā	-εῖον -eîon	-είω -eíō	-είᾱ -eíā	-είω -eíō	-εῖοι -eîoi	-εῖαι -eîai	-εῖᾰ -eîa
Genitive	-είου -eíou	-είᾱς -eíās	-είου -eíou	-είοιν -eíoin	-είαιν -eíain	-είοιν -eíoin	-είων -eíōn	-είων -eíōn	-είων -eíōn
Dative	-είῳ -eíōi	-είᾳ -eíāi	-είῳ -eíōi	-είοιν -eíoin	-είαιν -eíain	-είοιν -eíoin	-είοις -eíois	-είαις -eíais	-είοις -eíois
Accusative	-εῖον -eîon	-είᾱν -eíān	-εῖον -eîon	-είω -eíō	-είᾱ -eíā	-είω -eíō	-είους -eíous	-είᾱς -eíās	-εῖᾰ -eîa
Vocative	-εῖε -eîe	-είᾱ -eíā	-εῖον -eîon	-είω -eíō	-είᾱ -eíā	-είω -eíō	-εῖοι -eîoi	-εῖαι -eîai	-εῖᾰ -eîa
Derived forms	Adverb			Comparative			Superlative
Derived forms	-είως -eíōs			-ειότερος -eióteros			-ειότᾰτος -eiótatos
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension.