From ZooTerms (Dictionary of Invertebrate Zoology)
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gizzard (noun; Old French gezier, gizzard): 1. A grinding chamber of various invertebrates.

2. (Annelida: Oligochaeta) A muscular area of the digestive system between intestine and crop.

3. (Arthropoda) For Insecta and Crustacea, see proventriculus.

4. (Bryozoa: Gymnolaemata) In Ctenostomata, an elongate or spherical inner part of the cardia with pointed or rounded plates or teeth.

5. (Echiura) The short, muscular region of the posterior foregut usually marked by ringed or annular striations.

6. (Mollusca) A thickened muscular stomach, or lined with calcareous plates for crushing food.