Nouns denoting two and three dimensional shapes

acantha
any sharply pointed projection
 
intrados
the interior curve of an arch
 
disproportion
lack of proportion; imbalance among the parts of something
 
scallop
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.)
 
wart
any small rounded protuberance (as on certain plants or animals)
 
critical angle
the smallest angle of incidence for which light is totally reflected
 
cardioid
an epicycloid in which the rolling circle equals the fixed circle
 
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)
 
joint
the shape or manner in which things come together and a connection is made
 
oblique triangle
a triangle that contains no right angle
 
hexagon
a six-sided polygon
 
cube
a three-dimensional shape with six square or rectangular sides
 
tetrahedron
any polyhedron having four plane faces
 
gnarl
something twisted and tight and swollen
 
dimple
any slight depression in a surface
 
dip
a depression in an otherwise level surface
 
pocket
(bowling) the space between the headpin and the pins behind it on the right or left
 
rectangle
a parallelogram with four right angles
 
crescent
any shape resembling the curved shape of the moon in its first or last quarters
 
regular hexagon
a hexagon with six sides of equal length
 
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