cantharis

can·tha·ris

noun \ˈkan(t)-thə-rəs\

plural can·thar·i·des \kan-ˈthar-ə-ˌdēz\

Definition of CANTHARIS

1

: spanish fly 1

2

cantharides plural but singular or plural in construction : a preparation of dried beetles and especially Spanish flies that contains cantharidin and is used in medicine as a blister-producing agent and formerly as an aphrodisiac—called also Spanish fly