From ZooTerms (Dictionary of Invertebrate Zoology)
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hood (noun; Anglo-Saxon hod): 1. A color marking or expansion suggesting a hood.

2. (Arthropoda: Chelicerata) In beetle mites, the dorsal wall of the camerostome that extends over the capitulum.

3. (Arthropoda: Insecta) a. In notodontoid and noctuoid Lepidoptera, a counter-tympanal cavity that expands laterally to form a covering for the tympanal cavity posteriorly. b. In tingid Hemiptera, the dorsal elevated longitudinal carinae.

4. (Chaetognatha) A body-wall fold with a coelomic sac which can be drawn over the head.

5. (Mollusca: Cephalopoda) In Nautiloidea, thickened membrane of fused sheaths of the dorsal tentacles, which serve for protection when the animal is retracted into the shell.