Definitions from Wiktionary (oestrum)
▸ noun:  (obsolete) A biting insect; a gadfly or botfly.
▸ noun:  (figurative, now rare) Something that stings or incites one to frenzy or action; an impulse or passion.
▸ noun:  (physiology, zoology, now rare) Estrus.estrum, oestrus, perioestrus, oestrogen, oestrin, anestrus, estro, stud, female, menstruum, more...
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