The Collaborative International Dictionary
Tanystomata
Tanystomata \Tan`y*stom"a*ta\, n. pl. [NL., fr. Gr. ? to stretch + ?, ?, mouth.] (Zo["o]l.) A division of dipterous insects in which the proboscis is large and contains lancelike mandibles and maxill[ae]. The horseflies and robber flies are examples.