cycloid(n = noun.shape) - a line generated by a point on a circle rolling along a straight line;
is a kind of line roulette, roulette
has particulars: curate cycloid, prolate cycloid
Derived form adjective cycloidal1
cycloid(s = adj.all) cycloidal - resembling a circle;
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]
Of or pertaining to the Cycloidei. [1913 Webster]
One of the Cycloidei. [1913 Webster]
cycloid, n. Math. a curve traced by a point on a circle when the circle is rolled along a straight line.
Derivative:
cycloidal adj.
Etymology:
Gk kukloeides (as CYCLE, -OID)
N circularity, roundness, rotundity, circle, circlet, ring, areola, hoop, roundlet, annulus, annulet, bracelet, armlet, ringlet, eye, loop, wheel, cycle, orb, orbit, rundle, zone, belt, cordon, band, contrate wheel, crown wheel, hub, nave, sash, girdle, cestus, cincture, baldric, fillet, fascia, wreath, garland, crown, corona, coronet, chaplet, snood, necklace, collar, noose, lasso, lassoo, ellipse, oval, ovule, ellipsoid, cycloid, epicycloid, epicycle, semicircle, quadrant, sextant, sector, sphere, round, rounded, circular, annular, orbicular, oval, ovate, elliptic, elliptical, egg-shaped, pear-shaped, cycloidal, spherical, I watched the little circles die.