| quadratrix | <geometry> A curve made use of in the quadrature of other curves; as the quadratrix, of Dinostratus, or of Tschirnhausen. Source: Websters Dictionary (01 Mar 1998) |
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| quadrature | 1. <mathematics> The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of abscissas. 2. A quadrate; a square. 3. <mathematics> The integral used in obtaining the area bounded by a curve; hence, the definite integral of the product of any function of one variable into the differential of that variable. 4. <astronomy> The position of one heavenly body in respect to another when distant from it 90 deg, or a quarter of a circle, as the moon when at an equal distance from the points of conjunction and opposition. Quadrature of the moon, a point in an orbit which is at either extremity of the latus rectum drawn through the empty focus of the orbit. See: Quadrate. Origin: L. Quadratura: cf. F. Quadrature. Source: Websters Dictionary (01 Mar 1998) |
| quadratus femoris muscle | <anatomy> Insertion, intertrochanteric ridge; origin, lateral border of tuberosity of ischium; action, rotates thigh laterally; nerve supply, nerve to quadratus femoris (sacral plexus). Synonym: musculus quadratus femoris, quadrate muscle of thigh. (05 Mar 2000) |
| quadratus lumborum | <anatomy, muscle> Origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves. Synonym: musculus quadratus lumborum, lumbar quadrate muscle, quadrate muscle of loins. (05 Mar 2000) |
| quadratus muscle | <anatomy> A muscle that is more or less square in shape. Synonym: musculus quadratus, quadrate muscle. (05 Mar 2000) |
| quadratus plantae | <anatomy, muscle> Origin, by two heads from the lateral and medial borders of the inferior surface of the calcaneus; insertion, tendons of flexor digitorum longus; action, assists long flexor; nerve supply, lateral plantar. Synonym: musculus flexor accessorius, musculus quadratus plantae, accessory flexor muscle of foot, caro quadrata sylvii, musculus pronator pedis, plantar quadrate muscle, quadrate muscle of sole. (05 Mar 2000) |