‖Pec‐tos″tra‐ca (pĕk‐tŏs″trȧ‐kȧ), n. pl. [NL., fr. Gr. πηκτόσ fixed + ὄστρακον shell of a testacean.] (Zoöl.) A degenerate order of Crustacea, including the Rhizocephala and Cirripedia.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.