i Register
In some senses, oestrum is marked as obsolete, archaic, figuratively. Watch for register when choosing this word.
oestrum
noun 3
Definitions
noun
1
A biting insect; a gadfly or botfly.
In the œstrum or gadfly, the wimble draws out like the pieces of a spy-glass […].
2
Something that stings or incites one to frenzy or action; an impulse or passion.
3
Estrus.
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