osmeterium

osmeterium
os·me·te·ri·um (ŏz'mĭ-tîrʹē-əm) n. pl. os·me·te·ri·a (-tîrʹē-ə)
An eversible glandular sac on the first thoracic segment of many caterpillars that secretes an unpleasant-smelling substance to ward off predators.
  [New Latin osmētērium, from Greek osmē, smell.]

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