From Longman Dictionary of Contemporary Englishldoce_215_bmannequinman‧ne‧quin /ˈmænəkɪn/ noun [countable] 1 DCCa model of the human body, used for showing clothes in shop windows2 
old-fashionedDCC a woman whose job is to wear fashionable clothes and show them to people SYN model
old-fashionedDCC a woman whose job is to wear fashionable clothes and show them to people SYN modelExamples from the Corpus
mannequin• She allowed herself to be posed like a mannequin, but drew in on herself when he let her go.• Her skin was clear and pure, like the plastic on a mannequin.• And then it just lies there on the screen, with all the inert charm of a well-dressed mannequin.• His new inamorata is a 22-year-old mannequin named Jennifer.• The dancers would dance, the mannequin would shiver and give birth to the green girl.• The mannequin, pictured below, will be unveiled in Selfridges in London.Origin mannequin (1700-1800) French Dutch mannekijn “little man” 