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Entry 1 sense Webster, 1913

Pectostraca

/(pĕk*tŏs"trȧ*kȧ)/ · Pec·tos·tra·ca · IPA
01 prop. n. pl. A degenerate order of Crustacea, including the Rhizocephala and Cirripedia.
  1. 1.
    A degenerate order of Crustacea, including the Rhizocephala and Cirripedia.(Zool.)