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a. A plane curve everywhere equidistant from a given fixed point, the center.
b. A planar region bounded by a circle.
c. Something, such as a ring, shaped like such a plane curve.
2. A circular or nearly circular course, circuit, or orbit: a satellite's circle around the earth.
3. A traffic circle.
4. A series or process that finishes at its starting point or continuously repeats itself; a cycle.
5. A group of people sharing an interest, activity, or achievement: well-known in artistic circles.
6. A territorial or administrative division, especially of a province, in some European countries.
7. A sphere of influence or interest; domain.
8. Logic A vicious circle.
v. cir·cled, cir·cling, cir·cles
1. To make or form a circle around: The hedge circles the fountain.
2. To move in a circle around: The ship circled the island.
To move in a circle. See Synonyms at turn.
circle the wagons
To take a defensive position; become defensive.

[Middle English cercle, from Old French, from Latin circulus, diminutive of circus, circle, from Greek kirkos, krikos; see sker- in Indo-European roots.]

cir′cler (-klər) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Nusslein-Volhard, "Genetic analysis of vertebrate sensory hair cell mechanosensation: the zebrafish circler mutants," Neuron, vol.
Table 1: Presentation of blood vessel diameters in Willis circler in relation to age Blood Respondents at age Respondents at age vessels group 25-34 years group over 60 years Mean Min.
I was a nervous pacer, a fidgeter, a circler of perimeters.