circle


Also found in: Dictionary, Thesaurus, Legal, Financial, Acronyms, Idioms, Encyclopedia, Wikipedia.

circle

 [ser´k'l]
a round figure, structure, or part.
Berry's c's charts with circles on them for testing stereoscopic vision.
cerebral arterial circle circle of Willis.
Minsky's circle a device for the graphic recording of eye lesions.
sensory circle a body area within which it is impossible to distinguish separately the impressions arising from two sites of stimulation.
circle of Willis the anastomotic loop of blood vessels near the base of the brain. Called also cerebral arterial circle.

cir·cle

(ser'kĕl),
1. anatomy a ring-shaped or anular structure or group of structures, as formed by anastomosing arteries or veins, or by connected (communicating) nerves.
2. A line or process with every point approximately equidistant from the center.
Synonym(s): circulus [TA]
[L. circulus]

circle

/cir·cle/ (ser´k'l) a round structure or part.
cerebral arterial circle  c. of Willis.
Berry's circles  charts with circles on them for testing stereoscopic vision.
defensive circle  the coexistence of two conditions which tend to have an antagonistic or inhibiting effect on each other.
circle of Haller  a circle of arteries in the sclera at the site of the entrance of the optic nerve.
Minsky's circles  a series of circles used for the graphic recording of eye lesions.
circle of Willis  the anastomotic loop of vessels near the base of the brain.

circle

Etymology: L, circulus
(in anatomy) a circular or nearly circular structure of the body, such as the circle of Willis and circle of Zinn. circular, adj.

cir·cle

(sĭr'kĕl)
1. A ring-shaped structure or group of structures.
Synonym(s): circulus (1) [TA] .
2. A line or process with every point equidistant from the center.
[L. circulus]

cir·cle

(sĭr'kĕl)
anatomy ring-shaped or anular structure or group of structures, as formed by anastomosing arteries or veins, or by connected (communicating) nerves.
[L. circulus]

circle

a round figure, structure or part.

circle block
see ring block.
ciliary arterial circle
formed from the anterior ciliary arteries; lies within the ciliary muscle.
iridial arterial circle
formed from the posterior long ciliary arteries and supplying blood to the iris.
iridial vascular circle
a ring of vessels formed by the anterior ciliary arteries; provide fine branches to the iris and ciliary body.
circle of safety
circle system
see breathing circuit.
circle test
walking a horse in a small circle, first one direction then the other, is used in a neurological examination to detect ataxia and abnormalities in proprioception.
circle of Willis
anastomotic loop of vessels near the base of the brain. See cerebral arterial circle.
References in periodicals archive ?
Gustaitis, a Circle Peak advisory board member, has more than 25 years of consumer packaged goods experience and most recently held the position of President and Chief Operating Officer for Kozy Shack Enterprises, a leading manufacturer and marketer of refrigerated pudding.
Q Advisors, a Denver, Colorado-based investment banking partnership providing mergers and acquisitions, and private placement advisory services, acted as exclusive financial advisor to Circle Graphics in connection with this transaction.
Christiansen, familiar with the drum circles that meet regularly at Venice Beach and Griffith Park, thought the group drumming experience that engages mind, body and spirit would immediately appeal to children as well as teens and adults.
Whether this perception stems from the fact that some students may feel like they carry a greater load in a group discussion or feel they have to do more work to in a literature circle unit, these issues must be a factor in teacher decision making.
13 Repeat Steps 1 to 12 using a paper circle made from a manila folder.
Although in principle we should see identical light coming from the matching circles in the sky, in reality, effects such as noise obscure the circle pairs.
Have participants hold the Raccoon Circle with both hands in front of them, and state:
The corner opposite the designated circle will back-pedal five more yards after the "Go
Richard Barth, a director at City Planning, says the object is to restore the Circle and create a streetscape that will make it a special place.
Circle T Explorer invests only in alternative managers at the early stages of development, which is typically when the manager's assets under management are between $10 million and $300 million.
Oh, Gazecki has found the circles themselves, hundreds of them, plastered throughout the loftily titled film ``Crop Circles: Quest for Truth'' like a majestic array of aerial post cards.
A staple of geometry textbooks, the circle is already the subject of myriad theorems and countless exercises.