dithyridium

noun
di·​thy·​rid·​i·​um | \ ¦dīˌthīˈridēəm, ˌdithəˈr-\
plural -s

Definition of dithyridium

: a larva of certain taenioid tapeworms consisting of a scolex invaginated into an elongated solid body

History and Etymology for dithyridium

New Latin, from di- + Greek thyridion, diminutive of thyra door

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