Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A four-sided plane figure with four right angles.

from The Century Dictionary.

  • noun A right-angled triangle.
  • Rectangular; right-angled.
  • noun A quadrilateral plane figure having all its angles right angles and its opposite sides consequently equal.
  • noun The product of two lengths.
  • noun A right angle.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) A four-sided figure having only right angles; a right-angled parallelogram.
  • adjective rare Rectangular.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry A quadrilateral having opposing sides parallel and four right angles.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a parallelogram with four right angles

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French, from Medieval Latin rēctangulum, a right triangle, from Late Latin rēctiangulum : Latin rēctus, right; see reg- in Indo-European roots + Latin angulus, angle.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle French, from Old French, from Medieval Latin rectanglum ("right angle"), from rectus ("right") + angulus ("an angle").

Examples

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