The Collaborative International Dictionary of English v.0.48:

Puffin \Puf"fin\ (p[u^]f"f[i^]n), n. [Akin to puff.]
   1. (Zool.) An arctic sea bird Fratercula arctica) allied to
      the auks, and having a short, thick, swollen beak, whence
      the name; -- called also bottle nose, cockandy,
      coulterneb, marrot, mormon, pope, and sea
      parrot.
      [1913 Webster]

   Note: The name is also applied to other related species, as
         the horned puffin (Fratercula corniculata), the
         tufted puffin (Lunda cirrhata), and the razorbill.
         [1913 Webster]

   Manx puffin, the Manx shearwater. See under Manx.
      [1913 Webster]

   2. (Bot.) The puffball.
      [1913 Webster]

   3. A sort of apple. [Obs.] --Rider's Dict. (1640).
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Puffball \Puff"ball`\, n. (Bot.)
   A kind of ball-shaped fungus (Lycoperdon giganteum, and
   other species of the same genus) full of dustlike spores when
   ripe; -- called also bullfist, bullfice, puckfist,
   puff, and puffin.
   [1913 Webster]

WordNet (r) 3.0 (2006):

puffin
    n 1: any of two genera of northern seabirds having short necks
         and brightly colored compressed bills