in architecture, a peristyle of a circular figure; or a series of columns disposed in a circle, and insulated within side.

A polyfile Colonnade, is that whose numbers of columns is too great to be taken in by the eye at a single view. Such is the colonnade of the palace of St Peter's at Rome, consisting of 284 columns of the Doric order, each above four feet and an half diameter, all in Tiburtine-marble.