- 1. n. The external hard or firm covering of many invertebrate animals. Source: opted
- 2. n. The outer integument of a seed; the episperm, or spermoderm. Source: opted
- 3. n. protective outer layer of seeds of flowering plants Source: wordnet
- 4. 1. (Zoöl.) The external hard or firm covering of many invertebrate animals. Note: The test of crustaceans and insects is composed largely of chitin; in mollusks it is composed chiefly of calcium carbonate, and is called the shell. 2. (Bot.) The outer integument of a seed; the episperm, or spermoderm. Source: webster
- 5. n. protective outer layer of seeds of flowering plants Source: ecdict
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