Final answer:
An erythematous tympanic membrane (TM) would be abnormal for the ear, indicating inflammation or infection.
Step-by-step explanation:
An erythematous TM would be abnormal for the ear. TM stands for tympanic membrane, which is also known as the eardrum, a thin membrane that separates the external ear from the middle ear and is responsible for transmitting sound vibrations. Erythematous refers to the reddening of the skin or membranes due to inflammation or infection. Therefore, when an erythematous TM is mentioned, it indicates that there is some inflammation or infection causing redness of the tympanic membrane, which is abnormal and may signify an ear condition such as otitis media.