types:
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Gaussian curve, Gaussian shape, bellshaped curve, normal curve
a symmetrical curve representing the normal distribution

meander
a bend or curve, as in a stream or river

closed curve
a curve (such as a circle) having no endpoints

Sshape
a double curve resembling the letter S

catenary
the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points

Cupid's bow
the double curve of the upper lip when considered to resemble Cupid's bow

undulation, wave
an undulating curve

extrados
the exterior curve of an arch

gooseneck
something in a thin curved form (like the neck of a goose)

intrados
the interior curve of an arch

bend, crook, turn, twist
a circular segment of a curve

crotchet, hook
a sharp curve or crook; a shape resembling a hook

envelope
a curve that is tangent to each of a family of curves

arc
a continuous portion of a circle

crenation, crenature, crenel, crenelle, scallop
one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)

spiral
a plane curve traced by a point circling about the center but at increasing distances from the center

helix, spiral
a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle

perversion
a curve that reverses the direction of something

sinuosity, sinuousness
having curves

arch
a curved shape in the vertical plane that spans an opening

bell, bell shape, campana
the shape of a bell

arc, bow
something curved in shape

crescent
any shape resembling the curved shape of the moon in its first or last quarters

quadric, quadric surface
a curve or surface whose equation (in Cartesian coordinates) is of the second degree

line roulette, roulette
a line generated by a point on one figure rolling around a second figure

limb
the graduated arc that is attached to an instrument for measuring angles

oxbow
a Ushaped curve in a stream

rainbow
an arc of colored light in the sky caused by refraction of the sun's rays by rain

Jordan curve, simple closed curve
a closed curve that does not intersect itself

uncus
(biology) any hookshaped process or part

bight
a bend or curve (especially in a coastline)

double helix
a pair of parallel helices intertwined about a common axis

hyperboloid
a quadric surface generated by rotating a hyperbola around its main axis

cycloid
a line generated by a point on a circle rolling along a straight line

sine curve, sinusoid
the curve of y=sin x

epicycloid
a line generated by a point on a circle rolling around another circle

hypocycloid
a line generated by a point on a circle that rolls around inside another circle