D defs.my
Entry 1 sense Webster, 1913

Trireme

/trīr'-ēmˌ/ · Tri·reme · IPA /ˈtɹaɪ.ɹiːm/
01 n. An ancient galley or vessel with tree banks, or tiers, of oars.
  1. 1.
    An ancient galley or vessel with tree banks, or tiers, of oars.(Class. Antiq.)