oestrum

== English == === Etymology === From Latin oestrum, variant of oestrus. === Noun === oestrum (countable and uncountable, plural oestrums) (obsolete) A biting insect; a gadfly or botfly. [17th–19th c.] (figurative, now rare) Something that stings or incites one to frenzy or action; an impulse or passion. [from 17th c.] (physiology, zoology, now rare) Estrus. [from 18th c.] === Anagrams === rems out