mesozoan

noun
me·​so·​zo·​an | \ -ˈzō-ən \

Medical Definition of mesozoan

: any of the animals that comprise the taxon Mesozoa, that includes small wormlike parasitic forms with an outer layer of somatic cells and an inner mass of reproductive cells, and that are often regarded as intermediate in organization between the protozoans and the metazoans although they may be degenerate descendents of more highly organized forms

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mesozoan adjective

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