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ol·i·go·chaete | \ ˈä-li-gō-ˌkēt 
, ˈō-; ə-ˈli-gə- \
, ˈō-; ə-ˈli-gə- \Definition of oligochaete
: any of a class or order (Oligochaeta) of hermaphroditic terrestrial or aquatic annelids (such as an earthworm) that lack a specialized head
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The first known use of oligochaete was in 1855
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