Syn. -- Metaphor; fable. -- Allegory, Parable. "An allegory differs both from fable and parable, in that the properties of persons are fictitiously represented as attached to things, to which they are as it were transferred. . . . A figure of Peace and Victory crowning some historical personage is an allegory. "I am the Vine, ye are the branches" [John xv. 1-6] is a spoken allegory. In the parable there is no transference of properties. The parable of the sower [Matt. xiii. 3-23] represents all things as according to their proper nature. In the allegory quoted above the properties of the vine and the relation of the branches are transferred to the person of Christ and His apostles and disciples." C. J. Smith.
An allegory is a prolonged metaphor. Bunyan's "Pilgrim's Progress" and Spenser's "Faërie Queene" are celebrated examples of the allegory.