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osmeterium

[oz-mi-teer-ee-uh m]
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noun, plural os·me·te·ri·a [oz-mi-teer-ee-uh] /ˌɒz mɪˈtɪər i ə/.
  1. a glandular process on the first thoracic segment of many caterpillars that emits a noxious odor to ward off predators.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018