From ZooTerms (Dictionary of Invertebrate Zoology)
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mandible (noun; Latin mandibula, jaw): 1. A jaw.

2. (Annelida: Polychaeta) The ventral chitinous plates or rods, maybe dentate, against which the maxilla work.

3. (Arthropoda: Crustacea) One of the third pair of cephalic appendages.

4. (Arthropoda: Diplopoda) The first pair of jaws, consisting of cardo, stipes and gnathal lobe.

5. (Arthropoda: Insecta) One of the variously modified anterior pair of paired mouthpart structures.

6. (Bryozoa) A modified orificial wall of the avicularium

See also: operculum.