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 Antonyms of adj rectangular2 senses of rectangular Sense 1rectangular -- (having four right angles; "a rectangular figure twice as long as it is wide")INDIRECT (VIA angular) -> rounded -- (curving and somewhat round in shape rather than jagged; "low rounded hills"; "rounded shoulders")Sense 2orthogonal, 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")INDIRECT (VIA parallel, perpendicular) -> oblique -- (slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled; "the oblique rays of the winter sun"; "acute and obtuse angles are oblique angles"; "the axis of an oblique cone is not perpendicular to its base")INDIRECT (VIA perpendicular, oblique) -> parallel -- (being everywhere equidistant and not intersecting; "parallel lines never converge"; "concentric circles are parallel"; "dancers in two parallel rows")Similarity of adj rectangular2 senses of rectangular Sense 1rectangular -- (having four right angles; "a rectangular figure twice as long as it is wide")       => angular (vs. rounded), angulate -- (having angles or an angular shape)Sense 2orthogonal, 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")       => perpendicular (vs. oblique) (vs. parallel) -- (intersecting at or forming right angles; "the axes are perpendicular to each other") 2022, Cloud WordNet Browser