dithyridium
noun
di·thy·rid·i·um
¦dīˌthīˈridēəm,
ˌdithəˈr-
plural -s
: a larva of certain taenioid tapeworms consisting of a scolex invaginated into an elongated solid body
Word History
Etymology
New Latin, from di- + Greek thyridion, diminutive of thyra door