A deep to vivid purplish red to vivid red.
tr. & intr.v. crim·soned, crim·son·ing, crim·sons
To make or become deeply or vividly red.
[Middle English cremesin, from Old Spanish cremesín, Old Italian cremesino or Medieval Latin cremesīnus, all from Arabic qirmizī, from qirmiz, kermes insect; see KERMES.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.