Osmeterium Definition
 ŏzmĭ-tîrē-əm 
  osmeteria
  
    noun
  
 An eversible organ behind the head of certain caterpillars, containing strong-smelling chemicals that deter predators.
 American Heritage 
Other Word Forms of Osmeterium
Noun
Singular:
 osmeteriumPlural:
 osmeteriaOrigin of Osmeterium
-  New Latin, from Ancient Greek ὀσμή (osmÄ“, “smell"), ὀσμητός (osmÄ“tos, “smelled"). From Wiktionary 
- New Latin osmētērium from Greek osmē smell - From American Heritage Dictionary of the English Language, 5th Edition 
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