# quadrant

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## quadrant

[kwod´rant]**1.**one fourth of the circumference of a circle.

**2.**one of four corresponding parts, as of the abdominal surface, the dentition, the field of vision, or the tympanic membrane.

## qua·drant

(kwah'drănt),**1.**One quarter of a circle.

**2.**anatomy roughly circular areas are divided for descriptive purposes into quadrants. The abdomen is divided into right upper and lower and left upper and lower quadrants by a horizontal and a vertical line intersecting at the umbilicus. The breast is divided into quadrants by vertical and horizontal lines that intersect in the center of the nipple. Quadrants of the ocular fundus (superior and inferior nasal, superior and inferior temporal) are demarcated by a horizontal and a vertical line intersecting at the optic disc. The tympanic membrane is divided into anterosuperior, anteroinferior, posterosuperior, and posteroinferior quadrants by a line drawn across the diameter of the drum in the axis of the handle of the malleus and another intersecting the first at right angles at the umbo.

[L.

*quadrans,*a quarter]## quadrant

/quad·rant/ (kwod´rant)**1.**one fourth of the circumference of a circle.

**2.**one of four corresponding parts, or quarters, as of the surface of the abdomen or of the field of vision.

## quadrant (qdrnt, quad)

[kwod′rənt]

Etymology: L,

*quadrans,*a fourth part**1**one quarter of a circle.

**2**one quarter of an anatomical area formed by the division of the area by imaginary vertical and horizontal lines bisecting each other. See abdominal quadrant.

## quadrant

A quarter–eg, the liver is in the right upper quadrant of the abdomen. See Left lower quadrant, Left upper quadrant, Right lower quadrant, Right upper quadrant.## quad·rant

(kwahd'rănt)**1.**One quarter of a circle. anatomy Roughly circular areas are divided for descriptive purposes into quadrants. The abdomen is divided into right upper and lower and left upper and lower quadrants by a horizontal and a vertical line intersecting at the umbilicus.

**2.**Quadrants of the ocular fundus (superior and inferior nasal, superior and inferior temporal) are demarcated by a horizontal and a vertical line intersecting at the optic disc. The tympanic membrane is divided into anterosuperior, anteroinferior, posterosuperior, and posteroinferior quadrants by a line drawn across the diameter of the drum in the axis of the handle of the malleus and another intersecting the first at right angles at the umbo.

[L.

*quadrans,*a quarter]## quad·rant

(kwahd'rănt)**1.**In dentistry, one quarter of combined dental arches; there are two maxillary and two mandibular quadrants.

**2.**One quarter of a circle; various anatomic structures are described as having quadrants.

[L.

*quadrans,*a quarter]## quadrant,

*n*one quarter of a circle; also used to describe one fourth of the combined dental arches. One half of the maxillary dental arch is one quadrant of the combined dental arches.

## quadrant

1. one-quarter of the circumference of a circle.

2. one of four corresponding parts, or quarters, as of the surface of the abdomen or of the field of vision.

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