tro·pho·zo·ite (tr??f?-z???t?)n. An elongated cell that develops from a sporozoite or a merozoite of an apicomplexan parasite and that feeds and grows within the host.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.trophozoite (?tr?f??z??a?t) n (Pathology) the form of a sporozoan protozoan in the feeding stage. In the malaria parasite this stage occurs in the human red blood cell. Compare merozoiteCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014troph?o?zo?ite (?tr?f ??zo? a?t, ?tro? f?-) n. a protozoan in the metabolically active growth stage. [1905?10; tropho- + -zo (on) + -ite1] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.