gill

From ZooTerms (Dictionary of Invertebrate Zoology)
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« germarium | gill filaments »
gill (noun; Middle English gile, gill): 1. An external respiratory organ of various aquatic invertebrates.

2. (Arthropoda) Brachia or plastron.

3. (Echinodermata: Echinoidea) The plastron.

4. (Mollusca) The ctenidium.

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