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rectitude
recto
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rectangle

rec·tan·gle [ rék tàng g'l ] (plural rec·tan·gles)


noun 
Definition:
 
figure with four right angles: a two-dimensional geometric figure formed of four sides in which each angle is a right angle, especially one with adjacent sides of different length

[Late 16th century. Directly or via French< medieval Latin rect(i)angulum, < form of late Latin rectiangulus "straight angle" < Latin rectus "straight, right" + angulus "angle"]
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