blister beetle
US /ˈblɪstər biːtl/
UK /ˈblɪstər biːtl/
1.
a beetle of a family (Meloidae) that produces a substance (cantharidin) that irritates the skin and causes blisters, formerly used in medicine as a counterirritant and aphrodisiac.
:
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The farmer warned us about the blister beetle in the fields.
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Contact with a blister beetle can cause skin irritation.