What does sonor mean in Latin?

sonor, a noun, means “sound”.

What is the genitive of sonor?

The genitive singular is sonōris. sonor is masculine, third declension.

In classical Latin, [ˈsɔ.nɔr]; in ecclesiastical (church) Latin, [ˈsɔː.nor].

noun · masculinethird declension

sonor m (genitive sonōris)

Classical[ˈsɔ.nɔr]Ecclesiastical[ˈsɔː.nor]

sŏnor, ōris, m. sono,

I. a noise, sound, din (poet. and in post-Aug. prose for sonitus and sonus); sing., Lucr. 1, 644; 4, 567; 4, 570; Verg. G. 3, 199; id. A. 7, 462; Tac. A. 1, 65; 4, 48; App. M. 11, p. 258 fin.— Plur., Lucr. 5, 334; 6, 1185; Verg. A. 9, 651; Val. Fl. 5, 306; Tac. A. 14, 36; App. Dogm. Plat. 1, p. 9, 28; id. Flor. 3, p. 357, 4.

From the verb sonō (“to make a noise, to resound”) + -or (suffix creating deverbal nouns).