1. (n.) The second, or true, muscular stomach of birds, in which the food is crushed and ground, after being softened in the glandular stomach (crop), or lower part of the esophagus; the gigerium.

2. (n.) A thick muscular stomach found in many invertebrate animals.

3. (n.) A stomach armed with chitinous or shelly plates or teeth, as in certain insects and mollusks.

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