Uncomfortable Loudness Level (UCL): A measurement that is often made prior to the ordering of or programming of a hearing aid that determines, for speech or tones, the intensity level at which a patient judges a particular signal to be uncomfortably loud.
Umbo – the center-most point of the tympanic membrane and the point at which the tympanic membrane is most medially displaced. The manubrium of the malleus is attached at the umbo, and its medial pull creates the cone shape of the eardrum.
Unilateral: Pertaining to only one ear or one side of the head (i.e., The person with a hearing loss on the right but not the left has a unilateral hearing loss.).
Utricle – located in the vestibule of the inner ear, this structure along with the saccule sense “straight line” head motion