Definition of "life form" []

• The characteristic morphology of a mature organism. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "  Frogs are actually a far more advanced life form than we Homo Sapiens are."
• "The discovery that this life form could use only gaseous oxygen, rather than nitrates, in its redox energy machinery had driven the Observer on a frantic search for another unit to which the knowledge could be transferred."
• "A tall man, shoulders only slightly rounded by seventy years of nagging gravity; a powerfully built man, whose torso the blind might mistake for a home freezer; a handsome man, nose structurally sound enough to support what might have been the heaviest pair of horn-rimmed spectacles in Europe; a dignified man, despite a residual patch of snow-and-rust hair that resembled a wad of stuffing from a wino's mattress, Luc LeFever was so staid of bearing that on those rare occasions when he forged a smile, his body treated it as an infection, tripling its output of interferon in a frantic attempt to repulse the alien life form that had invaded it."