From ZooTerms (Dictionary of Invertebrate Zoology)
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arcuate (adjective; Latin diminutive arcus, bow): 1. Pertaining to being shaped like an arc; arch-like.

2. (Mollusca: Bivalvia) Referring to the ventral edge in some pelecypods.

3. (Porifera) Referring to the chelate microsclere in the form of one to three curved plates; commonly three plates.