What does rubia mean in Latin?

rubia, a noun, means “madder”.

What is the genitive of rubia?

The genitive singular is rubiae. rubia is feminine, first declension.

In classical Latin, [ˈrʊ.bi.a]; in ecclesiastical (church) Latin, [ˈruː.bi.a].

noun · femininefirst declension

rubia f (genitive rubiae)

Classical[ˈrʊ.bi.a]Ecclesiastical[ˈruː.bi.a]

femininemadder
c. 77-79 AD, Pliny the Elder, Naturalis Historia, 19.17The first of these is madder, the employment of which is necessary in dyeing wool and leather.

rŭbĭa, ae, f. 1. rubeus,

I. madder, Plin. 19, 3, 17, § 47: quam aliqui ereuthodanum vocant, id. 24, 11, 56, § 94; 35, 6, 26, § 45; Vitr. 7, 14.

Short for Latin rubia herba. rubia is derived from ruber (“red”).

Elsewhere

Proto-Berber