ˌsemēˌtendəˈnōsəs noun
( plural semitendi·no·si -ōˌsī)
Etymology: New Latin, from semitendinosus, adjective, from Latin semi- + New Latin tendinosus tendinous — more at tendinous
: a fusiform muscle of the posterior and inner part of the thigh that arises from the tuberosity of the ischium along with the biceps femoris and is inserted by a remarkably long round tendon which forms part of the inner hamstring into the inner surface of the upper part of the shaft of the tibia