World English Dictionary
coloration or colouration (ˌkʌləˈreɪʃən)
 
n
1.  arrangement of colour and tones; colouring
2.  apatetic aposematic See also cryptic the colouring or markings of insects, birds, etc
3.  unwanted extraneous variations in the frequency response of a loudspeaker or listening environment
 
colouration or colouration
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

colouration

in biology, the general appearance of an organism as determined by the quality and quantity of light that is reflected or emitted from its surfaces. Coloration depends upon several factors: the colour and distribution of the organism's biochromes (pigments), particularly the relative location of differently coloured areas; the shape, posture, position, and movement of the organism; and the quality and quantity of light striking the organism. The perceived coloration depends also on the visual capabilities of the viewer. Coloration is a dynamic and complex characteristic and must be clearly distinguished from the concept of "colour," which refers only to the spectral qualities of emitted or reflected light.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences for +colouration
Due to the genetic origin of roan colouration in cattle, this colour does not breed true.
They vary significantly in colouration between the numerous subspecies.
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