pseudomorph: Meaning and Definition of

pseu•do•morph

Pronunciation: (s'du-môrf"), [key]
— n.
  1. an irregular or unclassifiable form.
  2. a mineral having the outward appearance of another mineral that it has replaced by chemical action.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.