cometary nebula(kom -ĕ-tair-ee) A fan-shaped reflection nebula whose illuminating star lies at the vertex of the fan. Hubble's variable nebula is an example.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
cometary nebula[′käm·ə‚ter·ē ′neb·yə·lə]
A fan-shaped reflection nebula that resembles a comet in appearance.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.