Nouns denoting two and three dimensional shapes

hollow
a cavity or space in something
 
column
anything that approximates the shape of a column or tower
 
spherule
a small sphere
 
diameter
a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
 
hyperbola
an open curve formed by a plane that cuts the base of a right circular cone
 
spherical polygon
a figure on the surface of a sphere bounded by arcs of 3 or more great circles
 
midline
the median plane of the body (or some part of the body)
 
tesseract
the four-dimensional analogue of a cube
 
dermatoglyphic
the lines that form patterns on the skin (especially on the fingertips and the palms of the hands and the soles of the feet)
 
crookedness
a tortuous and twisted shape or position
 
spherical angle
an angle formed at the intersection of the arcs of two great circles
 
brachium
(biology) a branching or armlike part of an animal
 
striation
any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue
 
hypotenuse
the side of a right triangle opposite the right angle
 
toroid
the doughnut-shaped object enclosed by a torus
 
polyhedron
a solid figure bounded by plane polygons or faces
 
radius
a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
 
figure of eight
a two-dimensionsal figure having the shape of the number eight
 
nubble
a small lump or protuberance
 
frustum
a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed
 
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