Definition of hag

• n. - A witch, sorceress, or enchantress; also, a wizard.
• n. - An ugly old woman.
• n. - A fury; a she-monster.
• n. - 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 Hyperotpeta. Called also hagfish, borer, slime eel, sucker, and sleepmarken.
• n. - The hagdon or shearwater.
• n. - An appearance of light and fire on a horse's mane or a man's hair.
• v. t. - To harass; to weary with vexation.
• n. - A small wood, or part of a wood or copse, which is marked off or inclosed for felling, or which has been felled.
• n. - A quagmire; mossy ground where peat or turf has been cut.