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podex

podex Now only Zool.
  (ˈpəʊdɛks)
  [L. pōdex, pōdic-em anus, fundament.]
  The fundament, the rump; also, the last dorsal segment of the abdomen of insects, the pygidium.

1598 B. Jonson Ev. Man in his Hum. v. i, How Saturn, sitting in an ebon cloud, Disrobed his podex. 1706 Phillips, Podex,..the Fundament, or Breech. 1713 Derham Phys.-Theol. viii. vi. 415 The Male is less than the Female,..and its Podex not so sharp as the Females is. 1822–34 Good's Study Med. (ed. 4) IV. 4 These substances are contained in the respective sexes in two bags that unite near the podex. 1826 Kirby & Sp. Entomol. III. 390 Podex, the last dorsal segment of the abdomen.

Oxford English Dictionary

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