torus
(torus, toroid)
Princeton's WordNet
a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
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toroid
(torus, toroid)
Princeton's WordNet
a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
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epicycle
(epicycle)
Princeton's WordNet
a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
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hypocycloid
(hypocycloid)
Princeton's WordNet
a line generated by a point on a circle that rolls around inside another circle
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epicycloid
(epicycloid)
Princeton's WordNet
a line generated by a point on a circle rolling around another circle
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cardioid
(cardioid)
Princeton's WordNet
an epicycloid in which the rolling circle equals the fixed circle
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epicycle
(ˈɛp əˌsaɪ kəl)
Random House Webster's College Dictionary
a circle that rolls, externally or internally, without slipping, on another circle, generating an epicycloid or hypocycloid.
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hypocycloid
(ˌhaɪ pəˈsaɪ klɔɪd)
Random House Webster's College Dictionary
a curve generated by the motion of a point on the circumference of a circle that rolls internally, without slipping, on a fixed circle.
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epicycloid
(ˌɛp əˈsaɪ klɔɪd)
Random House Webster's College Dictionary
a curve generated by the motion of a point on the circumference of a circle that rolls externally, without slipping, on a fixed circle.
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epicycle
(ˈɛp əˌsaɪ kəl)
Random House Webster's College Dictionary
a circle whose center moves around in the circumference of a larger circle: used in Ptolemaic astronomy to account for irregularities in planetary motion.
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radius
(ˌaɪ)
Random House Webster's College Dictionary
a straight line extending from the center of a circle... sphere to the circumference or surface: The radius of a circle... half the diameter.
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cardioid
(ˈkɑr diˌɔɪd)
Random House Webster's College Dictionary
a heart-shaped curve traced by a point on a circle that rolls without slipping on another equal circle. Equation: r = a (1−cosA).
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segment
Webster Dictionary
a part cut off from a figure by a line or plane; especially, that part of a circle contained between a chord and an arc of that circle, or so much of the circle... is cut off by the chord; as, the segment acb in the Illustration
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connection
(əˈnɛk ʃən)
Random House Webster's College Dictionary
a circle... friends or associates or a member of such a circle.
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temperate zone
(Temperate Zone)
Princeton's WordNet
the part of the Earth's surface between the Arctic Circle and the Tropic of Cancer or between the Antarctic Circle and the Tropic of Capricorn; characterized by temperate climate
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circular
(circular, rotary, orbitual)
Princeton's WordNet
describing a circle; moving in a circle
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rotary
(circular, rotary, orbitual)
Princeton's WordNet
describing a circle; moving in a circle
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horizon
(əˈraɪ zən)
Random House Webster's College Dictionary
the great circle... the celestial sphere whose plane passes through the center of the earth and is parallel to the sensible horizon of a given position, or the plane of such a circle
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horizon
(əˈraɪ zən)
Random House Webster's College Dictionary
the small circle... the celestial sphere whose plane is tangent to the earth at the position of a given observer, or the plane of such a circle
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radius
Webster Dictionary
a right line drawn or extending from the center of a circle... the periphery; the semidiameter of a circle... sphere
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circlet
Webster Dictionary
a little circle; esp., an ornament for the person, having the form of a circle; that which encircles, as a ring, a bracelet, or a headband
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epicycloid
Webster Dictionary
a curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle
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encircle
Webster Dictionary
to form a circle about; to inclose within a circle... ring; to surround; as, to encircle one in the arms; the army encircled the city
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annulus
Webster Dictionary
the solid formed by a circle revolving around a line which is the plane of the circle but does not cut it
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quadrant
Webster Dictionary
the quarter of a circle, or of the circumference of a circle, an arc of 90¡, or one subtending a right angle at the center.
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hypocycloid
Webster Dictionary
a curve traced by a point in the circumference of a circle which rolls on the concave side in the fixed circle. Cf. Epicycloid, and Trochoid
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frigid zone
(ˌfrɪdʒ ɪˈdɛər)
Random House Webster's College Dictionary
either of two regions, one between the Arctic Circle and the North Pole, or one between the Antarctic Circle and the South Pole.
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epicycle
Webster Dictionary
a circle which rolls on the circumference of another circle, either externally or internally
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epicycle
Webster Dictionary
a circle, whose center moves round in the circumference of a greater circle; or a small circle, whose center, being fixed in the deferent of a planet, is carried along with the deferent, and yet, by its own peculiar motion, carries the body of the planet fastened to it round its proper center
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cat and mouse
(cat and mouse, cat and rat)
Princeton's WordNet
a game for children in which the players form a circle and join hands; they raise their hands to let a player inside the circle... lower their hands to bar a second player who is chasing the first
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