‖Ser″pu‐la (?), n.; pl.Serpulæ (#), E. Serpulas (#). [L., a little snake. See Serpent.] (Zoöl.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidæ. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.