‖Pe‐cop″te‐ris (pē̍‐kŏp″tē̍‐rĭs), n. [NL., fr. Gr. πέκειν to comb + πετρίσ a kind of fern.] (Paleon.) An extensive genus of fossil ferns; — so named from the regular comblike arrangement of the leaflets.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.