Nouns denoting two and three dimensional shapes

inclination of an orbit
(astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees
 
variation
the angle (at a particular location) between magnetic north and true north
 
buckle
a shape distorted by twisting or folding
 
extrados
the exterior curve of an arch
 
asterism
(mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light
 
equator
a circle dividing a sphere or other surface into two usually equal and symmetrical parts
 
angular distance
the angular separation between two objects as perceived by an observer
 
dewdrop
a drop of dew
 
AZ
the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian
 
spherule
a small sphere
 
zig
an angular shape characterized by sharp turns in alternating directions
 
drum
a bulging cylindrical shape; hollow with flat ends
 
node
any thickened enlargement
 
quadrangular prism
a prism whose bases are quadrangles
 
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)
 
sphere
a solid figure bounded by a spherical surface (including the space it encloses)
 
spherical triangle
a spherical polygon formed by the arcs of 3 great circles
 
knife
any long thin projection that is transient
 
envelope
a curve that is tangent to each of a family of curves
 
picture plane
the plane that is in the foreground of a drawing or painting; coextensive with but different from the objective surface of the work
 
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