The Collaborative International Dictionary of English v.0.48:

Bottle-nose \Bot"tle-nose`\ Bottle-nosed dolphin \Bot"tle-nosed`
dolphin\, n. (Zool.)
   1. A grey cetacean of the Dolphin family, of several species,
      as Delphinus Tursio and Lagenorhyncus leucopleurus, of
      Europe.

   Note: Also Tursiops truncatus -- a synonym?

   Syn: bottlenose dolphin.
        [1913 Webster +PJC]

   2. The puffin.
      [1913 Webster]

   3. a north Atlantic beaked whale with a bulbous forehead.

   Syn: bottle-nosed whale, bottlenose whale, Hyperoodon
        ampullatus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bottle-nosed dolphin
    n 1: any of several dolphins with rounded forehead and well-
         developed beak; chiefly of northern Atlantic and
         Mediterranean [syn: bottlenose dolphin, bottle-nosed
         dolphin, bottlenose]