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rectilinear (adj.)

1650s, "forming a straight line," with -ar + rectiline (1560s), from Late Latin rectilineus, from rectus "straight" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line") + linea "line" (see line (n.)). Of a figure, "bounded by straight lines," 1728. Related: Rectilineal "straight-lined" (1640s); rectilinearity.

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Definitions of rectilinear from WordNet

rectilinear (adj.)
characterized by a straight line or lines;
rectilinear patterns in wallpaper
the rectilinear propagation of light
Synonyms: rectilineal
From wordnet.princeton.edu