From ZooTerms (Dictionary of Invertebrate Zoology)
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furca (noun; plural furcae; Latin furca, fork): 1. Any forked process.

2. (Arthropoda: Crustacea) The caudal furca; cercopod.

3. (Arthropoda: Insecta) a. The cercopods; the forked sternal process arising from the thoracic sternum of pterygote insects formed by the sternal apophyses, supported on a medium inflection; referred to as pro-, meso, or metafurca. b. In Collembola, the modified abdominal jumping appendages

See also: furcula. c. In some male Lepidoptera, the sclerotized structure of the juxta. d. For furca of the labellum, see labellar sclerite.