"rectangular" in the adjective sense
1. rectangular
having four right angles
"a rectangular figure twice as long as it is wide"
2. orthogonal, rectangular
having a set of mutually perpendicular axes meeting at right angles
"wind and sea may displace the ship's center of gravity along three orthogonal axes"
"a rectangular Cartesian coordinate system"
Source: WordNet® (An amazing lexical database of English)
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