Thÿsan-ŏp'ter, n.

n. [Gr. θύσανος, a fringe, and πτερον, a wing.] (Entom.) One of an order of insects having long, membranous wings, which are nearly rudimentary, and are almost destitute of nerves, but fringed on the side with numerous close cilia. The species are very small; their metamorphosis is incomplete. Baird.