Lewis & Short

Ăcīdălĭa, ae, f., = Ἀκιδαλία, an epithet of Venus, perhaps from the Fountain Acidalius, in Boeotia, where the Graces, daughters of Venus, used to bathe, Verg. A. 1, 720 Serv.
Hence, Ăcīdălĭus, a, um, adj., pertaining to Venus: ludit Acidalio nodo, with the girdle of Venus, Mart. 6, 13: arundo, id. 9, 14: ales, i. e. a dove, Carm. ad Pis. 79.