What does āclys mean in Latin?

āclys, a noun, means “a small javelin attached to a strap”.

What is the genitive of āclys?

The genitive singular is āclydis. āclys is feminine, third declension.

In classical Latin, [ˈaː.klys]; in ecclesiastical (church) Latin, [ˈaː.klis].

noun · femininethird declension

āclys f (genitive āclydis)

Classical[ˈaː.klys]Ecclesiastical[ˈaː.klis]

a small javelin attached to a strap
Teretes sunt aclydes illis tela, sed haec lento mos est aptare flagello. Their arms are tapered javelins, which they wear bound by a coiling thong. ― tr.: T.C. Williams, The Æneid of Virgil translated into English verse (1908), bk vii, p. 25329–19 BC, P. Vergilius Maro (aut.), J.B. Greenough (ed.), Aeneis in The Bucolics, Æneid, and Georgics of Virgil (1900), bk vii, ll. 730f.
Iamque Ebusus Phoenissa movet, movet Arbacus arma,Now Phoenician Ebusus rises in arms; and the Arbacians, fierce fighters with the dart or slender javelin. ― tr.: ibidem, p. 141c. AD 83–96, Ti. Catius Asconius Silius Italicus (aut.), J.D. Duff (ed.), Punica I (1927), bk iii, ll. 362f (p. 140)

aclys, ўdis (better than aclis), = ἀγκυλίς (first used by Verg.),

I. a small javelin, Verg. A. 7, 730; Sil. 33, 362 al.; cf. Non. 554, 3.

First attested in Virgil’s Aeneid, taken from the Ancient Greek ἀγκῠλῐ́ς (ankŭlĭ́s, “hook”, “barb”).