Nouns denoting two and three dimensional shapes

convex polygon
a polygon such that no side extended cuts any other side or vertex; it can be cut by a straight line in at most two points
 
truncated pyramid
a frustum formed from a pyramid
 
perpendicular
a straight line at right angles to another line
 
join
the shape or manner in which things come together and a connection is made
 
recess
a small concavity
 
angle of extinction
the angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light
 
ovoid
an egg-shaped object
 
natural shape
a shape created by natural forces; not man-made
 
centerline
a line that bisects a plane figure
 
knife
any long thin projection that is transient
 
toroid
the doughnut-shaped object enclosed by a torus
 
stemma
a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work
 
crenature
one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)
 
sector
a plane figure bounded by two radii and the included arc of a circle
 
view angle
the angle included by a photographic lens
 
hoodoo
(geology) a column of weathered and unusually shaped rock
 
torsion
a tortuous and twisted shape or position
 
arc
a continuous portion of a circle
 
AZ
the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian
 
balance
equality of distribution
 
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