What does cybium mean in Latin?

cybium, a noun, means “A tunny fish; A dish made of pieces of the tunny fish salted and chopped”.

What is the genitive of cybium?

The genitive singular is cybiī. cybium is neuter, second declension.

noun · neutersecond declension

cybium n (genitive cybiī or cybī)

cўbĭum or -ĭon, ii, n., = κύβιον.

I. A tunny-fish, Varr. L. L. 5, § 77 Müll.; Mart. 11, 27, 3; cf. Paul. ex Fest. p. 52, 15 Müll.—

II. Meton., a dish made of pieces of the tunny-fish salted and chopped, Plin. 9, 15, 18, § 48; 32, 11, 53, § 151; Mart. 5, 79, 3.

From Ancient Greek κύβιον (kúbion).