Nouns denoting two and three dimensional shapes

vacancy
an empty area or space
 
pellet
a small sphere
 
element of a cylinder
a straight line running the length of the cylinder
 
obtuse angle
an angle between 90 and 180 degrees
 
perigon
an angle of 360 degrees
 
cuboid
a rectangular parallelepiped
 
circle
ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point
 
natural shape
a shape created by natural forces; not man-made
 
prolate cycloid
a cycloid generated by a point outside the rolling circle
 
epicycle
a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
 
dimple
any slight depression in a surface
 
element of a cone
a straight line joining the apex and a point on the base
 
tongue
any long thin projection that is transient
 
tower
anything that approximates the shape of a column or tower
 
tip
a V shape
 
arc
something curved in shape
 
octahedron
any polyhedron having eight plane faces
 
washout
the channel or break produced by erosion of relatively soft soil by water
 
cutting angle
the angle between the face of a cutting tool and the surface of the work
 
rectangle
a parallelogram with four right angles
 
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