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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