Tones
From The Glossary of Digital Photography
(1) The grays, or colors that are close to one another in lightness or darkness. (2) The colors created by adding gray to a primary color. See also tone

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
(1) The grays, or colors that are close to one another in lightness or darkness. (2) The colors created by adding gray to a primary color. See also tone