paracyl reflector

paracyl reflector

A cylindrical light reflector whose cross section is that of a semicircle joined to part of a parabola; they are joined so that the focus of the parabola is the center of the semicircle, at which point a linear light source is placed; esp. used for wall-washing.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.