What's the "een" in Halloween?
"characterized by swelling in the groin," by 1795, from Latin bubo (genitive bubonis) "swelling of lymph glands" (in the groin), from Greek boubon "the groin; swelling in the groin" + -ic. Bubonic plague attested by 1827.
bubonic bu·bon·ic (bōō-bŏn'ĭk, byōō-)
Of or relating to a bubo.