ἀρτιακός
ἀρτιακός, of even numbers
ἀρτῐ-ᾰκός, ή, όν,
- of even numbers, only in Adv. -κῶς, τὸ ἥμισυ ἀ. ὠνομασμένον the half called after the even number, Nicom. Ar. 1.9.