malleolus

malleolus (noun; plural malleoli; Latin diminutive malleus, hammer): 1. (Arthropoda: Chelicerata) In Solpugida, 3 to 5 innervated appendages on the coxae and trochanter of the fourth leg; function uncertain; racket-organs.

2. (Arthropoda: Insecta) see haltere.