Definition of: ceboid

(sē′boid) adjective Zool.
Pertaining to or describing any member of a superfamily or group (Ceboidea) of monkeys believed to have evolved from the prosimians isolated in South America, and including the marmosets, capuchins, tamarins, sapajous, and spider monkeys.
—noun A member of this superfamily or group: also ce·bid (sē′bid, seb′id). [<NL <Gk. kēbos, a long-tailed monkey]