‖A‐proc″ta (ȧ‐prŏk″tȧ), n. pl. [NL., fr. Gr. ἀ priv. + πρωκτόσ anus.] (Zoöl.) A group of Turbellaria in which there is no anal aperture.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.