OT Meaning of OT in English n.Variant: or oto- Function: combining form Etymology: Greek ō t-, ō to-, from ō t-, ous ― more at EAR : ear < ot itis> : ear and < oto laryngology> Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012