Definition of: plecopteran

(plə·kop′tər·ən) noun
Any of an order (Plecoptera) of soft–bodied, flattened insects of which the nymphs are aquatic: the adults usually have a pair of long caudal appendages, and two pairs of wings folding flat over the abdomen; a stone fly. [<Gk. plekein twine + pteron wing]