sawtooth

from WordNet (r) 3.0 (2006)

sawtooth
    n 1: a serration on a saw blade

from The Collaborative International Dictionary of English v.0.48

Sawtooth \Saw"tooth`\, n. (Zool.)
   An arctic seal ({Lobodon carcinophaga}), having the molars
   serrated; -- called also {crab-eating seal}.
   [1913 Webster]