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rectilinear (adj.)
[rectilinear 词源字典]
"forming a straight line," 1650s, with
-ar
+
rectiline
(1560s), from Late Latin
rectilineus
, from
rectus
"straight" (see
right
(adj.1)) +
linea
"line" (see
line
(n.)). Related:
Rectilineal
(1640s).
[rectilinear etymology, rectilinear origin, 英语词源]