From ZooTerms (Dictionary of Invertebrate Zoology)
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cast (noun; Old Norse kasta, throw): 1. Anything that is shed in a form resembling the original.

2. (Annelida: Oligochaeta) The excrement of an earthworm.

3. (Arthropoda: Insecta) The molted exoskeletons of arthropod instars.

4. (Mollusca) An extraneous substance molded in the interior of a fossil shell, the shell itself having disappeared.