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Any of numerous organisms, such as many fungi and protozoans, that are haploid except during the zygote stage.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
haplontan organism in the haploid stage.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005