• WordNet 3.6
    • n Callithrix type genus of the Callithricidae: true marmosets
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Century Dictionary and Cyclopedia
    • n callithrix A genus of South American platyrrhine monkeys, of the family Cebidœ and subfamily Nyctipithecinœ, having the tail not prehensile; the sagouins or saguins, of which there are numerous species. C. personatus, the masked sagouin, is an example. C. torquatus is the collared teetee.
    • n callithrix [lowercase] An African green monkey, Cercopithecus sabœus.
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In literature:

Callithrix Sciureus, wrinkling of eyes during screaming.
"More Letters of Charles Darwin Volume II" by Charles Darwin

In news:

Looking more like a creature out of a Steven Spielberg movie than one of our closer primate relatives, Callithrix saterei made its official debut as a new species of marmoset in 1996.