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Definition of: acanthocephalan
(ə·kan′thō·sef′ə·lən) noun
Any of a phylum (Acanthocephala) of worms that are parasitic as adults in the intestines of fishes and other vertebrates, having a proboscis covered with hooks. Also a·can′tho·ceph′a·lid [<ACANTHO- + Gk. kephalē head]
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