What does euthīa mean in Latin?

euthīa, a noun, means “straight line.”.

What is the genitive of euthīa?

The genitive singular is euthīae. euthīa is feminine, first declension.

In classical Latin, [ˈɛu̯.tʰi.a]; in ecclesiastical (church) Latin, [ˈɛːu̯.ti.a].

noun · femininefirst declension

euthīa f (genitive euthīae)

Classical[ˈɛu̯.tʰi.a]Ecclesiastical[ˈɛːu̯.ti.a]

euthīa, ae, f., = εὐθεῖα,

I. a straight line, Mart. Cap. 9, § 958.

Borrowed from Ancient Greek εὐθεῖα (eutheîa).