Lewis & Short

Leucădĭa, ae, and Leucas, ădis, f., = Λευκαδία, an island (previously a peninsula) in the Ionic Sea, opposite Acarnania, with a famous temple of Apollo, now S. Maura, Mel. 2, 7, 10; Plin. 4, 1, 2, § 5; Liv. 33, 17, 8; acc. Leucada, Ov. M. 15, 289; id. H. 15, 172.
Hence,

  1. A. Leucădĭus, a, um, adj., of or belonging to the island of Leucadia, Leucadian: aequor, Ov. H. 15, 166: litus, Plin. 4, 1, 2, § 5: vinum, id. 14, 7, 9, § 76; Plaut. Poen. 3, 3, 86: Dites damnosos maritos apud Leucadiam Oppiam, id. Curc. 4, 1, 24: deus, i. e. Apollo, who had a temple in Leucadia, Ov. Tr. 5, 2, 76; 3, 1, 42; cf. Apollo, Prop. 3, 11 (4, 10), 69: quotannis Tristia Leucadio sacra peracta modo (the Leucadians had a custom of casting every year a criminal from a mountain into the sea; they sought, however, by attaching wings to him, to break the violence of his fall, and to pick him up in boats, whereupon he was banished out of the island), Ov. F. 5, 630; cf. id. Tr. 5, 2, 76; id. H. 15, 165 sq.
    1. 2. Subst.
      1. a. Leu-cădĭa, ae, f., the mistress of Varro Atacinus, Prop. 2, 34 (3, 32), 86.
        1. (β) The name of a comedy of Turpilius, Cic. Tusc. 4, 34, 72.
      2. b. Leucădĭi, ōrum, m., the inhabitants of Leucadia, Leucadians, Liv. 33, 17.
  2. B. Leucas, ădis, f., the capital of Leucadia, Mel. 2, 3, 10; Plin. 4, 1, 2, § 5; Liv. 33, 17, 7; 11.