1) Italian surname 
Pair of structures at the tip of the abdomen.
• (pl. ) of Cercus
(singular: cercus) The paired appendages, often very long, which spring from the tip of the abdomen in many insects.
Plural of cercus. ... (05 Mar 2000) ... 
Slender, paired and segmented sensory appendages arising from the tenth abdominal segment of some insects.
(singular: Cercus) The paired appendages, often very long, which spring from the tip of the abdomen in many insects.
Type: Term Pronunciation: ser′sī Definitions: 1. Plural of cercus.
paired appendages on the abdomen of many insects.
(sing. cercus) slender, paired and segmented sensory appendages arising from the tenth abdominal segment of some insects
(plural form of cercus) sensory organs of an arthropod located on the back or hind end of arthropods