ear tag noun 2verb 2forms 6 noun2 •A tag attached to the ear of an animal (usually a farm animal) to identify ownership. •A benign growth of skin or cartilage on the ear near the tragus. verb2 •To apply an ear tag to an animal.By law calves must be ear tagged within 36 hours for dairy and 20 days for beef cattle. •to attach an ear tag to the ear of an animal. formsear tagged · ear-tagged · ear tagging · ear-tagging · ear tags · ear-tags