The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of various small clawed monkeys of the genera Callithrix and Cebuella, found in tropical forests of the Americas and having soft dense fur, tufted ears, and long tails.
the GNU version of the Collaborative International Dictionary of English
n. Any one of numerous species of small South American monkeys of the genera Hapale and Midas, family Hapalidæ. They have long soft fur, and a hairy, nonprehensile tail. They are often kept as pets. Called also squirrel monkey.
The Century Dictionary and Cyclopedia
n. A little ape or monkey.
n. Now, specifically, a small squirrel-like South American monkey of the family Hapalidæ, or Mididæ (which see for technical characters).
n. An ugly little fellow; a conceited “puppy.”
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. small soft-furred South American and Central American monkey with claws instead of nails
Word Usage
"Each individual marmoset is an amalgam of cells from two different marmosets."