an irregular or unclassifiable form.
a mineral having the outward appearance of another mineral that it has replaced by chemical action.

Origin of pseudomorph

First recorded in 1840–50; pseudo- + -morph
Related formspseu·do·mor·phic, pseu·do·mor·phous, adjectivepseu·do·mor·phism, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pseudomorph

Historical Examples of pseudomorph

British Dictionary definitions for pseudomorph



a mineral that has an uncharacteristic crystalline form as a result of assuming the shape of another mineral that it has replaced
Derived Formspseudomorphic or pseudomorphous, adjectivepseudomorphism, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for pseudomorph

"irregular form," 1838, earlier in German and French, from pseudo- + Greek morphe "form" (see Morpheus). Related: Pseudomorphic.

Online Etymology Dictionary, © 2010 Douglas Harper