unicorn, fabulous equine beast with a long horn jutting from the middle of its forehead. Once thought to be native to India, the unicorn was reportedly seen throughout the world. It was often considered as a composite creature, having the features of various animals. The unicorn is depicted as a beautiful animal, usually pure white in color. It has been used to represent virginity, but also has religious significance in connection with the Virgin Mary and Jesus. The hunting of the unicorn was a subject in tapestries of the late Middle Ages and the Renaissance.