• WordNet 3.6
    • adj lamellibranch bivalve
    • n lamellibranch marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together
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Webster's Revised Unabridged Dictionary
    • n Lamellibranch (Zoöl) One of the Lamellibranchiaalso called Pelecypoda). Also used adjectively.
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Century Dictionary and Cyclopedia
    • lamellibranch Having lamellate gills; pertaining to the Lamellibranchiata, or having their characters.
    • n lamellibranch One of the Lamellibranchiata, as any ordinary bivalve mollusk. Also lamellibranchiate.
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In literature:

A genus of Lamellibranchs ranging from the Lias to the present day.
"More Letters of Charles Darwin" by Charles Darwin
This organ is probably homologous with the byssogenous gland of Lamellibranchs.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5" by Various