dolphin /(dŏl"fĭn)/

dol·phin

dolphin

n.
  1. A cetacean of the genus Delphinus and allied genera (esp. Delphinus delphis); the true dolphin. (Zool.)
  2. The Coryphæna hippuris, a fish of about five feet in length, celebrated for its surprising changes of color when dying. It is the fish commonly known as the dolphin. The term is also applied to the related Coryphaena equisetis. Called also dolphinfish and (especially in Hawaii) mahimahi. See also dolphinfish and Coryphænoid. (Zool.)
  3. A mass of iron or lead hung from the yardarm, in readiness to be dropped on the deck of an enemy's vessel. (Gr. Antiq.)
  4. A kind of wreath or strap of plaited cordage. (Naut.)
  5. In old ordnance, one of the handles above the trunnions by which a cannon was lifted. (Gun.)
  6. A small constellation between Aquila and Pegasus. See Delphinus, n., 2. (Astron.)

Phrases & Compounds
Dolphin fly
the black, bean, or collier, Aphis (Aphis fable), destructive to beans.
Dolphin striker
a short vertical spar under the bowsprit.