IPA: /ˈsɜːrkəs/
KK: /ˈsɜrkəs/
A pair of sensory appendages found at the back end of some insects and arthropods, often used for sensing the environment.
The female mosquito uses its cercus to detect changes in air currents.
Cercus is derived from the Greek word "kérkos" (κέρκος), meaning tail or a projecting part. In biological terms, it refers to a tail-like structure in certain organisms.
Think of the Greek word for tail ('kérkos') to remember that 'cercus' refers to a tail-like structure.