cercus
cer·cus
noun \ˈsər-kəs\plural ; cer·ci \ˈsər-ˌsī, -ˌkī\ (audio pronunciation)
Definition of CERCUS
: either of a pair of simple or segmented appendages at the posterior end of various arthropods
Learn More About
Seen & Heard 
What made you want to look up cercus? Please tell us where you read or heard it (including the quote, if possible).
