“rectangles” is a form of
rectangle
/ˈrɛktæŋɡl̩/ noun, adjective
Forms rectangles
- noun (geometry) Any quadrilateral having opposing sides parallel and four right angles.
- noun (nontechnical) Such a quadrilateral that is oblong (longer than it is wide): one that is not regular (equilateral), that is, any except a square.
- noun (archaic) A right angle.
- noun (archaic) The product of two quantities.
- adjective (archaic) Right-angled. “a rectangle triangle”
Etymology
Borrowed from Middle French, from Old French, from Medieval Latin or Late Latin rectangulum (“right angle”), from Latin rectus (“right”) + angulus (“an angle”).
Webster’s 1913
- noun A four-sided figure having only right angles; a right-angled parallelogram.
- adjective Rectangular. [R.]
Etymology [F., fr. L. rectus right + angulus angle. See Right, and Angle.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “rectangle”, CC BY-SA 4.0. Details