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tr.v. ter·ra·formed, ter·ra·form·ing, ter·ra·forms
To transform (a landscape) on another planet into one having the characteristics of landscapes on Earth.
[Latin terra, earth; see terrace + form.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Literary & Literary Critical Terms) science fiction to alter a planet for the purpose of sustaining life
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
to alter the environment of (a celestial body) in order to make capable of supporting terrestrial life forms.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.