osmeterium
/ˌɒsmɪˈtɪərɪəm/(also osmaterium) Entomology
noun
An organ capable of emitting a penetrating or noxious odour; specifically an eversible gland on the first thoracic segment of certain papilionid caterpillars.
Origin
Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From ancient Greek ὀσμᾶσθαι to smell (from ὀσμή smell: see osmo-) + -τήριον, suffix forming nouns.
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