thyridium
noun
thy·rid·i·um
| \ -dēəm\
plural thyridia\ -Ä“É™ \
Definition of thyridium
1
: a pale spot in the wing vein of some insects especially of the orders Hymenoptera and Trichoptera
2
: one of a pair of oval pits on the second abdominal tergite of some hymenopterans
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