‖Ac″ri‐ta (�), n. pl. [NL., from Gr. � indiscernible; ἀ priv. + � to distinguish.] (Zoöl.) The lowest groups of animals, in which no nervous system has been observed.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.