Cubic
来自Big Physics
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late 15th century (in the sense ‘involving the cube (and no higher power)’): from Old French cubique, or via Latin from Greek kubikos, from kobos ‘cube’.
wiktionary
From Middle French cubique.
etymonline
cubic (adj.)
mid-15c., "being of the third power;" 1550s, "having the form of a cube," from Old French cubique (14c.), from Latin cubicus, from Greek kybikos, from kybos "cube" (see cube (n.)). Meaning "solid, three-dimensional" is from 1650s.
Cubical is attested from 1590s with the meaning "of or pertaining to a cube," and according to OED it is "Now more usual than cubic in this sense." Related: Cubically.
