The Collaborative International Dictionary of English v.0.48:
Hag \Hag\ (h[a^]g), n. [OE. hagge, hegge, witch, hag, AS.
h[ae]gtesse; akin to OHG. hagazussa, G. hexe, D. heks, Dan.
hex, Sw. h[aum]xa. The first part of the word is prob. the
same as E. haw, hedge, and the orig. meaning was perh., wood
woman, wild woman. [root]12.]
1. A witch, sorceress, or enchantress; also, a wizard. [Obs.]
"[Silenus] that old hag." --Golding.
2. An ugly old woman. --Dryden.
3. A fury; a she-monster. --Crashaw.
4. (Zool.) An eel-like marine marsipobranch (Myxine
glutinosa), allied to the lamprey. It has a suctorial
mouth, with labial appendages, and a single pair of gill
openings. It is the type of the order Hyperotreta.
Called also hagfish, borer, slime eel, sucker, and
5. (Zool.) The hagdon or shearwater.
6. An appearance of light and fire on a horse's mane or a
man's hair. --Blount.
Hag moth (Zool.), a moth (Phobetron pithecium), the larva
of which has curious side appendages, and feeds on fruit
Hag's tooth (Naut.), an ugly irregularity in the pattern of
matting or pointing.