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From The Collaborative International Dictionary of English v.0.48:
Bots \Bots\, n. pl. [Cf. Gael. botus belly worm, boiteag maggot.] (Zool.) The larv[ae] of several species of botfly, especially those larv[ae] which infest the stomach, throat, or intestines of the horse, and are supposed to be the cause of various ailments. [Written also botts.] Note: See Illust. of Botfly. [1913 Webster]