WordReference Random House Unabridged Dictionary of American English © 2026
a′corn worm′, 
  1. Invertebratesany of several burrowing, often brilliantly colored hemichordates of the class Enteropneusta, usually found in intertidal sand and mud, having an acorn-shaped proboscis and collar.
Also, a′corn•worm′. 
  • 1885–90

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