D defs.my
Entry 1 sense Webster, 1913

Spinnaker

/(spĭn"nȧ*kẽr)/ · Spin·na·ker · IPA /ˈspɪnəkɚ/
01 n. A large triangular sail set upon a boom, -- used when running before the wind.
  1. 1.
    A large triangular sail set upon a boom, -- used when running before the wind.(Naut.)