# Nouns denoting two and three dimensional shapes

- hemisphere
- half of a sphere

- conic
- (geometry) a curve generated by the intersection of a plane and a circular cone

- loop
- anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)

- sack
- an enclosed space

- exterior angle
- the supplement of an interior angle of a polygon

- 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)

- teardrop
- anything shaped like a falling drop (as a pendant gem on an earring)

- toroid
- the doughnut-shaped object enclosed by a torus

- arc
- a continuous portion of a circle

- intersection
- a point or set of points common to two or more geometric configurations

- 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)

- rut
- a groove or furrow (especially one in soft earth caused by wheels)

- equilateral
- a figure whose sides are all equal

- ovoid
- an egg-shaped object

- round shape
- a shape that is curved and without sharp angles

- heart
- a plane figure with rounded sides curving inward at the top and intersecting at the bottom; conventionally used on playing cards and valentines

- plane angle
- an angle formed by two straight lines (in the same plane)

- rim
- the shape of a raised edge of a more or less circular object

- thalweg
- the middle of the chief navigable channel of a waterway that forms the boundary line between states

- 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)

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