Acanthocephala

noun plural
Acan·​tho·​ceph·​a·​la | \ə-ˌkan(t)-thə-ˈsef-ə-lə \

Medical Definition of Acanthocephala 

: a group of elongated parasitic intestinal worms with a hooked proboscis that as adults lack a digestive tract and absorb food through the body wall, and that are usually classified as a separate phylum related to the phylum Platyhelminthes

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