eutheîa

eutheîa ὐθεῖᾰ gerade

ὐθεῖᾰ • (eutheîă) f (genitive εὐθείᾱς); first declension

(grammar) ellipsis of εὐθεῖα πτῶσις (eutheîa ptôsis, “nominative case”, literally “straight case”)
(geometry) ellipsis of εὐθεῖα γραμμή (eutheîa grammḗ, “straight line”)