- shaped like a rectangle
- having or relating to right angles
- mutually perpendicular: rectangular coordinates
- having a base or section shaped like a rectangle
WordReference Random House Unabridged Dictionary of American English © 2026
rec•tan•gu•lar
(rek tang′gyə lər),USA pronunciation adj.
rec•tan•gu•lar•i•ty
(rek tang′gyə lar′i tē),USA pronunciation rec•tan′gu•lar•ness, n.
rec•tan′gu•lar•ly, adv.
- Mathematicsshaped like a rectangle.
- Mathematicshaving the base or section in the form of a rectangle:a rectangular pyramid.
- Mathematicshaving one or more right angles.
- Mathematicsforming a right angle.
- Medieval Latin rēctangul(um) rectangle + -ar1
- 1615–25;
Collins Concise English Dictionary © HarperCollins Publishers::
rectangular /rɛkˈtæŋɡjʊlə/ adj
rec•tan•gle /ˈrɛkˌtæŋgəl/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Mathematicsa four-sided figure with parallel sides, having four right angles:Every square is a rectangle, but not every rectangle is a square.
rec•tan•gle
(rek′tang′gəl),USA pronunciation n.
- Mathematicsa parallelogram having four right angles.
- Medieval Latin rēctangulum, Late Latin rēctiangulum right-angled triangle (noun, nominal use of neuter of rēctiangulus having a right angle), equivalent. to rēcti- recti- + angulum angle1
- 1565–75
'rectangular' also found in these entries (note: many are not synonyms or translations):
amice
- attaché case
- bar
- basilica
- billiards
- block
- bloom
- board
- box
- box girder
- brick
- card
- carriage clock
- chase
- crease
- cuboid
- dentil
- domino
- durrie
- envelope
- fanlight
- flat
- float
- flyer
- forum
- koto
- length
- matrix
- Mercator projection
- Möbius strip
- mortise
- narthex
- obelisk
- oblong
- pallium
- penalty area
- pendentive
- pier
- pilaster
- pitch
- playing card
- plinth
- poncho
- prism
- quadrangle
- quadrate
- rabbet
- razor blade
- rectangular coordinates
- agnolotti