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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 ?
Pat Fisette, a member of Christ the King Lutheran Church in Van Nuys, had never heard of drum circles before Christiansen presented the idea at a recent Saturday evening service at her church.
We wanted to see if there would be any difference in scores on this student interest survey following the implementation of a literature circles unit, and whether the students preferred working together or individually when reading and discussion literature.
11 With the paper circle at the top, roll the taped pencils back and forth between your palms five times.
In a matter of days, serious dark circles begin to fade .
Spergel and his collaborators examined whether the dodecahedron satisfies a criterion called the circle test.
By using Raccoon Circles, camp staff can generate innumerable challenge activities.
Each unit will run "Team Fly," hitting all seven circles before the next unit steps in to repeat the process.
The Circle touches on these themes only glancingly, in the quick glimpse it offers of policemen confiscating newspapers at a corner kiosk, and in the atmosphere of fear and intimidation that reigns over its characters' lives.
Over the next few years, as the Circle is being reinvented at its edges by the Trump International Hotel & Tower and its icon globe, a new and hopefully special Coliseum project on the west, the recently opened Steelcase headquarters at No.
We get a helicopter pilot swearing that an impressive group of circles near Stonehenge - which a local farmer capitalized on by charging admission - came into existence in less than 45 minutes.
The question concerned a pattern made up of two identical circles that fit side by side inside a third circle.