Medical Dictionary


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noun plural Hir·u·din·ea \ˌhir-(y)ə-ˈdin-ē-ə\

Medical Definition of Hirudinea

  1. :  a class of hermaphroditic aquatic, terrestrial, or parasitic annelid worms distinguished by a coelom nearly obliterated by connective tissue and reduced to a series of vascular sinuses, by modification of the hindmost segments into a sucking disk, and by the absence of parapodia and setae

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to decrease in size, extent, or degree

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