Nouns denoting two and three dimensional shapes

triangle
something approximating the shape of a triangle
 
spherical polygon
a figure on the surface of a sphere bounded by arcs of 3 or more great circles
 
regular polygon
a polygon with all sides and all angles equal
 
obtuse triangle
a triangle that contains an obtuse interior angle
 
hyperboloid
a quadric surface generated by rotating a hyperbola around its main axis
 
HA
(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day
 
radius
a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
 
bight
a bend or curve (especially in a coastline)
 
prism
a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
 
catenary
the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points
 
figure eight
a two-dimensionsal figure having the shape of the number eight
 
complex plane
a geometric representation of the complex numbers established by the real axis and the orthogonal imaginary axis; it can be thought of as a modified Cartesian plane, with the real part of a complex number represented by a displacement along the x-axis, and the imaginary part by a displacement along the y-axis
 
quadrate
a square-shaped object
 
loop
anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)
 
Cupid's bow
the double curve of the upper lip when considered to resemble Cupid's bow
 
knot
something twisted and tight and swollen
 
ellipsoid
a surface whose plane sections are all ellipses or circles
 
cleft
a split or indentation in something (as the palate or chin)
 
scoop
a hollow concave shape made by removing something
 
S-shape
a double curve resembling the letter S
 
 List More