Definition of: thysanuran

(thī′sə·n oobreve r′ən, -ny oobreve r′-, this′ə-) adjective
Designating or belonging to an order (Thysanura) of primitive wingless insects, including the silverfish and the firebrat.
—noun One of the Thysanura. [<NL, name of the order <Gk. thysanos fringe + oura tail]
—thy′sa·nu′rous adjective