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unicolour

British  
/ ˈjuːnɪˌkʌlə /

adjective

  1. of one colour; monochromatic

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Athletes may use this emblem on their kit, which must otherwise be white or unicolour.

From BBC

Unicolour, ū-ni-kul′ur, adj. having but one colour.—adjs.

From Project Gutenberg

DESCRIPTION.—Pale yellow brown; upper lip, chin, and underneath yellowish-white; head varied with black-tipped hairs; tail cylindrical, unicolour, not so long as head and body.—Gray.

From Project Gutenberg