‖Thys′a‐nu″ra (?), n. pl.(Zoöl.) An order of wingless hexapod insects which have setiform caudal appendages, either bent beneath the body to form a spring, or projecting as bristles. It comprises the Cinura, or bristletails, and the Collembola, or springtails. Called also Thysanoura. See Lepisma, and Podura.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.