Nouns denoting two and three dimensional shapes

critical angle
the smallest angle of incidence for which light is totally reflected
 
angular shape
a shape having one or more sharp angles
 
blob
an indistinct shapeless form
 
angle of view
the angle included by a photographic lens
 
spherical angle
an angle formed at the intersection of the arcs of two great circles
 
rhombus
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
 
heart
a plane figure with rounded sides curving inward at the top and intersecting at the bottom; conventionally used on playing cards and valentines
 
pit
a concavity in a surface (especially an anatomical depression)
 
dome
a concave shape whose distinguishing characteristic is that the concavity faces downward
 
perimeter
a line enclosing a plane areas
 
vortex
the shape of something rotating rapidly
 
conglobation
a rounded spherical form
 
center line
a line that bisects a plane figure
 
vector
a straight line segment whose length is magnitude and whose orientation in space is direction
 
dimple
any slight depression in a surface
 
secant
a straight line that intersects a curve at two or more points
 
element
a straight line that generates a cylinder or cone
 
oblique triangle
a triangle that contains no right angle
 
S-shape
a double curve resembling the letter S
 
pucker
an irregular fold in an otherwise even surface (as in cloth)
 
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