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quadratus (n.)
Related entries & more "a square-shaped muscle," 1727, from Latin quadratus "square, squared," past participle of quadrare "to square, make square; put in order," related to quadrus "a square," quattuor "four" (from PIE root *kwetwer- "four"). Especially the Quadratus femoris, the muscle situated at the back of the hip-joint.
gluteus (n.)buttocks muscle, 1680s, from Modern Latin glutaeus, from Greek gloutos "the rump," in plural, "the buttocks."
Related entries & more soleus (n.)muscle of the calf of the leg, 1670s, Modern Latin, from Latin solea "sole" (see sole (n.1)). So called for its flatness.
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trapezius (n.)muscle over the back of the neck, 1704, from Modern Latin trapezius (musculus), masc. adjective from trapezium (see trapezium). So called from the shape they form.
Related entries & more phrenic (adj.)
Related entries & more "of or pertaining to the diaphragm," 1704, from Modern Latin phrenicus, from Greek phrēn "the diaphragm, muscle which parts the heart and lungs from the digestive organs" (see phreno-).
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