Meaning of gastric mill

gas'tric mill'

Pronunciation: [key]
— Zool. Zool.
  1. a gizzard in decapod crustaceans, as lobsters, crabs, and shrimps, having an arrangement of teeth and small bones for grinding food and bristles for filtering small particles.
  2. gizzard (def. 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.