ven ‧ tril ‧ o ‧ quist /venˈtrɪləkwəst, venˈtrɪləkwɪst/ BrE AmE noun [countable]
[ Date: 1700-1800 ; Language: Late Latin ; Origin: ventriloquus 'ventriloquist' , from Latin venter ( ↑ ventral ) + loqui 'to speak' ; from the belief that the voice comes from the ventriloquist's stomach ]
someone who entertains people by speaking without moving their lips and making it seem that the words are spoken by a model of a person called a ↑ dummy
—ventriloquism noun [uncountable]