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Reproducing by cross-fertilization between individuals of different mating types. Used of certain fungi and algae.

[hetero- + Greek thallos, young shoot; see thallo- + -ic.]

het′er·o·thal′lism n.
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.


1. (Botany) (of some algae and fungi) having male and female reproductive organs on different thalli
2. (Botany) (of some fungi) having sexual reproduction that occurs only between two self-sterile mycelia
[C20: from hetero- + Greek thallos green shoot, young twig]
ˌheteroˈthallism, ˌheteroˈthally n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌhɛt ər əˈθæl ɪk)

having mycelia of two unlike types, both of which must participate in the sexual process.
[1900–05; hetero- + thall(us) + -ic]
het`er•o•thal′lism, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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