Medical Definition of gluteus maximus
plural glutei max·i·mi \-sə-ˌmī\play
: the outermost of the three muscles in each buttock that arises from the sacrum, coccyx, back part of the ilium and adjacent structures, that is inserted into the fascia lata of the thigh and the gluteal tuberosity of the femur, and that acts to extend and laterally rotate the thigh
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