Search Result for "tar pit":
Wordnet 3.0

NOUN (1)

1. a natural accumulation of bitumens at the surface of the earth; often acts as a trap for animals whose bones are thus preserved; 



WordNet (r) 3.0 (2006):

tar pit
    n 1: a natural accumulation of bitumens at the surface of the
         earth; often acts as a trap for animals whose bones are
         thus preserved