vinculum

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vinculum (noun; plural -la; Latin vinculum, anything used for binding): 1. Anything used to bond structures together.

2. (Arthropoda: Insecta) In male Lepidoptera, an U-shaped genital plate, dorsally articulating with the pedunculus and midventrally forming a saccus.

3. (Mollusca: Bivalvia) A shelly material between the basic dental structures of the shell.