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Any of numerous organisms, such as many fungi and protozoans, that are haploid except during the zygote stage.

[Greek haploos, single, simple; see haploid + -ont.]

hap·lon′tic adj.
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.


(Biology) biology an organism, esp a plant, that has the haploid number of chromosomes in its somatic cells
haˈplontic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhæp lɒnt)

the haploid individual in a life cycle that has a diploid and a haploid phase.
[1915–20; hapl(oid) + -ont < Greek ont-, s. of ṓn being, present participle of eînai to be (compare onto-)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Other authors have used still different terminology for these three life cycles: "haplontic,'" "diplontic," and "diplohaplontic" (Pritchard & Bradt, 1984).
Since these advanced charophyceans are fundamentally gametophytic organisms, with simple, haplontic life cycles (and zygotic meiosis)--no sporophyte being present in their life cycles--we should strongly suspect that the sporophyte was developed (in very early land plants originating from charophyte-like predecessors) antithetically, as an addition to the life cycle (by mitosis of a zygote retained on the gametophyte) and in response to newly available terrestrial (at least amphibious) habitats.