Nouns denoting two and three dimensional shapes
- stemma
- a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work
- spiral
- a plane curve traced by a point circling about the center but at increasing distances from the center
- Cupid's bow
- the double curve of the upper lip when considered to resemble Cupid's bow
- ellipse
- a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
- conoid
- a shape whose base is a circle and whose sides taper up to a point
- bifurcation
- a bifurcating branch (one or both of them)
- sphere
- a solid figure bounded by a spherical surface (including the space it encloses)
- lead
- the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)
- crease
- a slight depression or fold in the smoothness of a surface
- hyperbola
- an open curve formed by a plane that cuts the base of a right circular cone
- oblong
- a plane figure that deviates from a square or circle due to elongation
- intrados
- the interior curve of an arch
- tetragon
- a four-sided polygon
- twist
- a sharp bend in a line produced when a line having a loop is pulled tight
- rhomb
- a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
- roulette
- a line generated by a point on one figure rolling around a second figure
- dome
- a concave shape whose distinguishing characteristic is that the concavity faces downward
- groove
- a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)
- scoop
- a hollow concave shape made by removing something
- lower bound
- (mathematics) a number equal to or less than any other number in a given set
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