A greenish blue, one of the subtractive primary colors.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "cyan" in a sentence
"Scientists have used three fluorescent proteins in cyan, yellow and red – colours similar to those used by a computer printer – to colour the brain of a mouse."
"The opposite of yellow in pigments and dyes is magenta+cyan, which is blue."
"The first challenge is to find the colour fabrics needed: bright green, bright yellow, black and cyan, which is a bluey-green sort of pale turquiose."