| quadrate pronator muscle | <anatomy, muscle> Origin, distal fourth of anterior surface of ulna; insertion, distal fourth of anterior surface of radius; action, pronates forearm; nerve supply, anterior interosseous. Synonym: musculus pronator quadratus, quadrate pronator muscle. (05 Mar 2000) |
|---|---|
| quadratic | 1. Of or pertaining to a square, or to squares; resembling a quadrate, or square; square. 2. <chemistry> Tetragonal. 3. <mathematics> Pertaining to terms of the second degree; as, a quadratic equation, in which the highest power of the unknown quantity is a square. Origin: Cf. F. Quadratique. Source: Websters Dictionary (01 Mar 1998) |
| quadratics | <study> That branch of algebra which treats of quadratic equations. Source: Websters Dictionary (01 Mar 1998) |
| quadratojugal | <anatomy> Of or pertaining to the quadrate and jugal bones. Of or pertaining to the quadratojugal bone. The quadratojugal bone, a bone at the base of the lower jaw in many animals. Source: Websters Dictionary (01 Mar 1998) |
| 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) |
| 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) |
| quadri- | Four. Origin: L. Quattuor (05 Mar 2000) |
| quadribasic | <chemistry> Same as Tetrabasic. Source: Websters Dictionary (01 Mar 1998) |
| quadric | <mathematics> A surface whose equation in three variables is of the second degree. Spheres, spheroids, ellipsoids, paraboloids, hyperboloids, also cones and cylinders with circular bases, are quadrics. Of or pertaining to the second degree. Source: Websters Dictionary (01 Mar 1998) |
| quadricapsular | <botany> Having four capsules. Source: Websters Dictionary (01 Mar 1998) |
| quadriceps femoris | <anatomy, muscle> Origin, by four heads: rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis; insertion, patella, and thence by ligamentum patellae to tuberosity of tibia; action, extends leg; flexes thigh by action of rectus femoris; nerve supply, femoral. Synonym: musculus quadriceps femoris, musculus quadriceps extensor femoris, quadriceps muscle of thigh. (05 Mar 2000) |