‖Cir′ros″to‐mi (?), n. pl. [NL., fr. E. cirrus + Gr. � mouth.] (Zoöl.) The lowest group of vertebrates; — so called from the cirri around the mouth; the Leptocardia. See Amphioxus.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.