Any polyhedron having four plane faces.
Roget 95:
quaternity†,
four,
tetrad,
quartet,
quaternion,
square,
quarter.
[planar form with four sides]
tetract†,
tetragon,
quadrangle,
rectangle.
[three dimensional object with four surfaces]
tetrahedron.
quadrature,
quadrifoil,
quadriform,
quadruplet;
quatrefoil.
[object or animal with four legs]
tetrapod.
[geographical area with four sides]
quadrangle,
quad [Coll.].
[electromagnetic object]
quadrupole.
[four fundamental studies]
quadrivium.
... show more
Roget 244:
angularity,
angularness†;
aduncity†;
angle,
cusp,
bend;
fold
etc.
258;
notch
etc.
257;
fork,
bifurcation.
elbow,
knee,
knuckle,
ankle,
groin,
crotch,
crutch,
crane,
fluke,
scythe,
sickle,
zigzag,
kimbo†,
akimbo.
corner,
nook,
recess,
niche,
oriel [Arch.],
coign†.
right angle
etc.
(perpendicular)
216.1,
212;
obliquity
etc.
217;
angle of 45 degrees,
miter;
acute angle,
obtuse angle,
salient angle,
reentering angle,
spherical angle.
angular measurement,
angular elevation,
angular distance,
angular velocity;
trigonometry,
goniometry;
altimetry†;
clinometer,
graphometer†,
goniometer;
theodolite;
sextant,
quadrant;
dichotomy.
triangle,
trigon†,
wedge;
rectangle,
square,
lozenge,
diamond;
rhomb,
rhombus;
quadrangle,
quadrilateral;
parallelogram;
quadrature;
polygon,
pentagon,
hexagon,
heptagon,
octagon,
oxygon†,
decagon.
pyramid,
cone.
Platonic bodies;
cube,
rhomboid;
tetrahedron,
pentahedron,
hexahedron,
octahedron,
dodecahedron,
icosahedron,
eicosahedron;
prism,
pyramid;
parallelopiped;
curb roof,
gambrel roof,
mansard roof.
... show more
Dutch: regelmatig viervlak, viervlak
Polish: czworościan