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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A notch; a cleft; a barb; a ragged or sharp protuberance; a denticulation. Arethuss arose . . . From rock and from jag. (Shelley) Garments thus beset with long jags. (Holland)

2. A part broken off; a fragment.

3. (Science: botany) a cleft or division. Jag bolt, a bolt with a nicked or barbed shank which resists retraction, as when leaded into stone.

Origin: Prob. Of Celtic origin; cf. W. Gag aperture, cleft, chink; akin to ir. & gael. Gag

alternative forms: jagg.