(n) (meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern, Ant.anticyclone
‖n. pl. [ NL., fr. Gr. ky`klos circle + NL. ganoidei. See Ganoid. ] (Zool.) An order of ganoid fishes, having cycloid scales. The bowfin (Amia calva) is a living example. [ 1913 Webster ]
n. [ Cyclo- + -oid: cf. F. cycloïde. ] (Geom.) A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane. [ 1913 Webster ]
☞ The common cycloid is the curve described when the generating point (p) is on the circumference of the generating circle; the curtate cycloid, when that point lies without the circumference; the prolate or inflected cycloid, when the generating point (p) lies within that circumference. [ 1913 Webster ]
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