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Webster 1913 Edition

Noun.

pl.

(Zool.)

See

botts ‎(uncountable)

The disease caused by the maggots of the horse bot fly when they infect the stomach of a horse.
(by extension) Infection by gadfly maggots under the skin of cows, or by sheep maggots in the frontal sinus of sheep.

The noun is usually used in the plural with the definite article. ("The botts")