From ZooTerms (Dictionary of Invertebrate Zoology)
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buttress (noun; Old French bouterez, to thrust): 1. (Arthropoda: Insecta) In Culicidae pupae, a sclerotized, thickened basolateral part of the paddle; external buttress; external thickening; nervure.

2. (Mollusca: Bivalvia) A radiating ridge on the interior that reinforces the hinge process.