(pl. cerci): One-segmented, pad-like lobe, paired. Anus positioned between cerci.
(pi., cerci) an appendage (generally paired) near the end of the abdomen, often segmented but sometimes not and often important in insect classification
(pl., cerci) Paired sensory structures on the last or second last metasomal tergite; the cercus is sometimes a setose finger-like projection that articulates with the tergum, but more often it looks like a low tubercle or plate-like structure that bears several long setae (see cercal plate); sometimes called the pygostylus. [drawing] [photo][drawing