Definition: 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.
Definition: A thick muscular stomach found in many invertebrate
animals.
Definition: A stomach armed with chitinous or shelly plates or teeth,
as in certain insects and mollusks.
