chroma

[kroh-muh] Origin

chro·ma

[kroh-muh]
noun
1.
the purity of a color, or its freedom from white or gray.
2.
intensity of distinctive hue; saturation of a color.

Origin:
1885–90; < Greek chrôma color
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Chroma is always a great word to know.
So is doohickey. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
chroma (ˈkrəʊmə)
 
n
1.  See also saturation the attribute of a colour that enables an observer to judge how much chromatic colour it contains irrespective of achromatic colour present
2.  (in colour television) the colour component in a composite coded signal
 
[C19: from Greek khrōma colour]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

chroma
1889, from Gk. khroma "color" (see chromatic).
Online Etymology Dictionary, © 2010 Douglas Harper
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