Nouns denoting two and three dimensional shapes

quadrangular prism
a prism whose bases are quadrangles
 
rut
a groove or furrow (especially one in soft earth caused by wheels)
 
brachium
(biology) a branching or armlike part of an animal
 
diamond
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
 
line of Saturn
a crease on the palm; palmists say it indicates how successful you will be
 
stemma
a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work
 
asterism
(mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light
 
undecagon
an eleven-sided polygon
 
star
a plane figure with 5 or more points; often used as an emblem
 
vertical angle
either of two equal and opposite angles formed by the intersection of two straight lines
 
shapelessness
an amorphous or indefinite shape
 
regular tetrahedron
a tetrahedron with four equilateral triangular faces
 
mold
the distinctive form in which a thing is made
 
arc
a continuous portion of a circle
 
loop
anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)
 
cardioid
an epicycloid in which the rolling circle equals the fixed circle
 
angle of reflection
the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence
 
catenary
the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points
 
imprint
a concavity in a surface produced by pressing
 
notch
a V-shaped indentation
 
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