n 1  :  a narrow deep hollow on the surface of the crown of a horse's incisor tooth that gradually becomes obliterated by the wearing away of the crown and therefore is indicative of the animal's age and usu. disappears from the lower central incisors about the sixth year while traces may remain in the upper until the eleventh  2  :  an impression or trace made or occurring on something - see BIRTHMARK STRAWBERRY MARK   3  :  a cut (as an ear notch) made on livestock for identification marked adj 
 
 
 
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