[With sense 1 cf. JACK sb.1 30; with 2 cf. jedge, JADGE.]
† 1. = JACK sb.1 30, a young pike. Obs.
1611. Cotgr., Lanceron, a Ieg, or Iacke; a Pickerell thats about a foot long.
1708. Motteux, Rabelais, IV. lx. (1737), 246. [in a list of fish, shell-fish, etc.] Jegs.
2. (See quot.)
1875. Knight, Dict. Mech., Jeg, a templet or gage for verifying shapes of parts in gun and gun-stock making.