Nouns denoting two and three dimensional shapes

geodesic
(mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere)
 
conoid
a shape whose base is a circle and whose sides taper up to a point
 
quadric
a curve or surface whose equation (in Cartesian coordinates) is of the second degree
 
figure of eight
a two-dimensionsal figure having the shape of the number eight
 
rim
the shape of a raised edge of a more or less circular object
 
cylinder
a solid bounded by a cylindrical surface and two parallel planes (the bases)
 
loop
anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)
 
octagon
an eight-sided polygon
 
perpendicular
a straight line at right angles to another line
 
sag
a shape that sags
 
sinuousness
having curves
 
vector
a straight line segment whose length is magnitude and whose orientation in space is direction
 
asymptote
a straight line that is the limiting value of a curve; can be considered as tangent at infinity
 
flank
a subfigure consisting of a side of something
 
facet plane
the plane of a facet of an object (as of a cube)
 
incurvature
a shape that curves or bends inward
 
cup
any cup-shaped concavity
 
ellipsoid of revolution
a shape that is generated by rotating an ellipse around one of its axes
 
projection
any solid convex shape that juts out from something
 
regular tetrahedron
a tetrahedron with four equilateral triangular faces
 
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