osmeterium definition

  • noun:
    • An eversible glandular sac regarding very first thoracic part of many caterpillars that secretes an unpleasant-smelling substance to prevent predators.
    • certainly one of a couple of scent body organs in the larvae of particular swallowtail butterflies.
    • In entomology, any organ dedicated to producing a scent or odor; specifically, a forked process located on the first part behind the pinnacle of certain butterfly-larvæ.

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