LATIN DICTIONARYLexicon Latīnum
proper noun · neutersecond declension

Casīnum

Casīnum n sg (genitive Casīnī)
Classical[kaˈsiː.nũː]Ecclesiastical[kaˈs̬iː.num]

Meaning

  1. a town in Latium, east of Aquīnum, now ruins near San Germano (a.k.a. Cassino); its citadel the present Monte Cassino

Declension

declension
formsingularplural
nominativeCasīnum—
genitiveCasīnī
Cassīnī
—
dativeCasīnō
Cassīnō
—
accusativeCasīnum—
ablativeCasīnō
Cassīnō
—
vocativeCasīnum—
locativeCasīnī
Cassīnī
—

Căsīnum, i, n.,
I. a town of Latium, east of Aquinium, now ruins near S. Germano: its citadel the present Monte Casino, Varr. L. L. 7, § 29, p. 86 Bip.; id. R. R. 3, 4, 2; Plin. 3, 5, 9, § 63.—
II. Hence the adjj.,
A. Căsīnas, ātis, of Casinum: ager, Cato, R. R. 136; Cic. Agr. 2, 25, 65: fundus, id. Phil. 2, 40, 103; and absol.: in Casinati or Casinate, in the region of Casinum, Varr. R. R. 2, 3, 11; Plin. 2, 103, 106, § 227.—
B. Căsīnus, a, um, of Casinum: Nymphae, Sil. 12, 527 dub. (others, Casini Nymphae).

Origins

Of uncertain origin. Said by Varro to be of Oscan/Samnite origin and to mean "old forum." However, compare Casilinum, Casinomagus, Casuentum. According to Villar, from Proto-Indo-European *ḱas- (“grey”), similar to canus, followed by the common name suffix -inum.

In the Academy Smith's classical dictionaries

Quick answers

What does Casīnum mean in Latin?
Casīnum, a proper noun, means “a town in Latium, east of Aquīnum, now ruins near San Germano (a.k.a. Cassino); its citadel the present Monte Cassino”.
What is the genitive of Casīnum?
The genitive singular is Casīnī. Casīnum is neuter, second declension.
How do you pronounce Casīnum?
In classical Latin, [kaˈsiː.nũː]; in ecclesiastical (church) Latin, [kaˈs̬iː.num].