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plural rectangles
(geometry) Any quadrilateral having opposing sides parallel and four right angles. examples
(nontechnical) Such a quadrilateral that is oblong (longer than it is wide): one that is not regular (equilateral), that is, any except a square. examples
(archaic) A right angle. quotations
For why should you praise, for example, the integrity of a Square who faithfully defends the interests of his client, when you ought in reality rather to admire the exact precision of his Rectangles?
1884, A Square [pseudonym; Edwin A. Abbott], Flatland […] , London: Seeley & Co., Part I: This World, § 12.— Of the Doctrine of our Priests, page 46
(archaic) The product of two quantities. quotations
In Lines it [the product] is always (and ſometimes in Numbers) call'd the Rectangle between the two Lines, multiply'd by one another.
1728, E[phraim] Chambers, “Product”, in Cyclopædia: Or, An Universal Dictionary of Arts and Sciences; […] In Two Volumes, volumes II (I–Z), London: […] James and John Knapton [et al.], page 886, column 1
not comparable
(archaic) Right-angled.