Meaning of oestrum | Babel Free

Definitions

1. A biting insect; a gadfly or botfly.
   countable, obsolete, uncountable
2. Something that stings or incites one to frenzy or action; an impulse or passion.
   archaic, countable, figuratively, uncountable
3. Estrus.
   archaic, countable, uncountable

Examples

“In the œstrum or gadfly, the wimble draws out like the pieces of a spy-glass […].”

CEFR level