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Haematobranchia

plural noun Hae·ma·to·bran·chia \ ˌhēmətōˈbraŋkēə , ˌhem- \
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Definition of Haematobranchia

in some classifications
: a division of arthropods consisting of the trilobites, eurypterids, and horseshoe crabs
—

haematobranchiate

\-ēˌāt\ adjective

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Origin and Etymology of haematobranchia

New Latin, from hemat- + -branchia

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