CMY
From The Glossary of Digital Photography
An abbreviation for cyan (C), magenta (M), and yellow (Y), the three primary colors in a subtractive color system. They are most commonly seen in conjunction with black (K), in CMYK systems. See also CMYK

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
An abbreviation for cyan (C), magenta (M), and yellow (Y), the three primary colors in a subtractive color system. They are most commonly seen in conjunction with black (K), in CMYK systems. See also CMYK