orbicula

/AO1 R B IH0 K Y AH0 L AH0/
noun
  1. 1

    A dorsal sclerite over a hymenopteran arolium; a hard exoskeletal feature with species-specific shape that overhangs and protects the adhesive tip of such an insect's leg and around which the claw(s) curl. Abbreviation "or" or "rb".

  2. 2

    (zoology, dated) A discina (brachiopod).