Definition of "rhesus" [‖Rhe•sus]

• A rhesus monkey. (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.

• "Sex differences in rhesus monkey toy preferences parallel those of children"
• "And finding such a dynamic in rhesus monkeys would confirm their value as genetic and behavioral models for studying human behavior."
• "One morning this past May, Elizabeth Mallott, a researcher working at Suomi’s lab, arrived to start her day at the main rhesus enclosure and found a half-dozen monkeys in her parking spot."