Nouns denoting two and three dimensional shapes

corrugation
a ridge on a corrugated surface
 
conoid
a shape whose base is a circle and whose sides taper up to a point
 
sphere
a solid figure bounded by a spherical surface (including the space it encloses)
 
crotch
the region of the angle formed by the junction of two branches
 
polygonal shape
a closed plane figure bounded by straight sides
 
pocket
(bowling) the space between the headpin and the pins behind it on the right or left
 
plane figure
a two-dimensional shape
 
equilateral triangle
a three-sided regular polygon
 
cast
the distinctive form in which a thing is made
 
oblong
a plane figure that deviates from a square or circle due to elongation
 
angular distance
the angular separation between two objects as perceived by an observer
 
link
a connecting shape
 
twist
a circular segment of a curve
 
sheet
(mathematics) an unbounded two-dimensional shape
 
dermatoglyphic
the lines that form patterns on the skin (especially on the fingertips and the palms of the hands and the soles of the feet)
 
cup
any cup-shaped concavity
 
belly
a part that bulges deeply
 
parallel
(mathematics) one of a set of parallel geometric figures (parallel lines or planes)
 
drop
a shape that is spherical and small
 
arc
a continuous portion of a circle
 
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