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annular ligament a ligament in the form of a circle, esp. around the ankle or wrist joint.
arctic (often capitalized) the region around the North Pole and inside the Arctic Circle. [1/3 definitions]
around in a circle. [3/11 definitions]
azimuth an arc measured horizontally and clockwise from a point north, in navigation, or a point south, in astronomy, to another point where a vertical circle intersects the horizon. [1/2 definitions]
ball bearing a machine part made of a groove in the shape of a circle with metal balls that roll in it. A ball bearing lets an axle or other part move easily.
belle a popular and admired woman, usu. young and often considered the most outstanding beauty at a social event or in a social circle.
bull's-eye the center of a round target, usually marked with a small circle. [1/2 definitions]
cabochon a polished gemstone, usu. in the form of a circle or ellipse, without facets. [1/2 definitions]
celestial equator a great circle, corresponding to the earth's equator, on the celestial sphere.
center of a circle the fixed point that is equidistant from all points that form a circle.
chord1 a line that connects two points on a circle.
circle anything that is shaped like a circle. [3/5 definitions]
circlet a little circle, esp. a narrow round band worn as an ornament for the head.
circular having the shape of a circle; round. [2 definitions]
circulation motion in a circle or along a circuit. [1/4 definitions]
circumcenter in geometry, the center of a circumscribed circle, which is a circle is that touches all the vertices of a polygon.
circumference the line that forms the outside edge of a circle or other round figure or area. [1/2 definitions]
closed chain a group of chemically linked atoms that can be represented in models and formulas as a ring or circle.
compass to go all the way around; circle. [1/9 definitions]
compass card a round card showing the points of the compass and degrees of a circle that is fitted within a compass case.
cone a solid figure with a flat base in the shape of a circle and one curved face that narrows into a point. [1/3 definitions]