quadrant

(redirected from Circular quadrant)
Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia.

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.
Quadrants of the abdomen. From Polaski and Tatro, 1996.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

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.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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]
Medical Dictionary for the Dental Professions © Farlex 2012