Learn how to say Cercopithecoidea correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word cercopithecoid:
a primate of a group that comprises the Old World monkeys.
Superfamily Cercopithecoidea and family Cercopithecidae
relating to cercopithecoid monkeys.
late 19th century: from modern Latin Cercopithecoidea, based on Greek kerkopithēkos, a long-tailed monkey (from kerkos ‘tail’ + pithēkos ‘ape’)