Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


The female gametophyte that arises from a megaspore of a heterosporous plant. In angiosperms, the megagametophyte is the embryo sac.
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.


(Botany) the female gametophyte, which develops from the megaspore
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌmɛg ə gəˈmi təˌfaɪt)

the female gametophyte in seed plants.
meg`a•ga•me`to•phyt′ic (-gəˌmi təˈfɪt ɪk, -ˌgæm ɪ-) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.megagametophyte - the female gametophyte produced by the megaspore of a plant that produces both microspore and megasporesmegagametophyte - the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores
gametophyte - the gamete-bearing individual or phase in the life cycle of a plant having alternation of generations
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Mentioned in ?
References in periodicals archive ?
High temperature stress of Brassica napus during flowering reduces micro- and megagametophyte fertility, induces fruit abortion, and disrupts seed production.
An additional mitosis of these nuclei an eight-nucleate megagametophyte was formed in the early-July (Fig.
Analyses to determine the role of the megagametophyte and other seed tissues in dormancy maintenance of yellow cedar (Chamaecyparis nootkatensis) seeds: morphological, cellular and physiological changes following moist chilling and during germination.
Organogenesis from megagametophyte and zygotic embryo explants of the gymnosperm Dioon edule Lindley (Zamiaceae, Cycadales).
Normally the three cells nearest the micropyle degenerate, leaving only one functional megaspore to develop into the megagametophyte.
Besides, the developmental features of megagametophyte and embryo seem to be very significant not only for systematic comparisons, but also for the knowledge of development and fertilization process.
When the pollen grain comes in contact with the nucellus, it forms a pollen tube that grows slowly toward the megagametophyte. At this time, the megaspore mother cell has not undergone meiosis.
The objectives of the present work were to describe the temporal pattern of seed set in buckwheat when grown under controlled greenhouse conditions, and to evaluate whether seed set is limited by post-zygotic events such as abortion or resource limitation, or by pre-zygotic events such as flower abortion or abnormal megagametophyte development.
Study of ovule and megagametophyte development in four species of subtribe Phaseolinae (Leguminosae).
The micropylar cell is functional megaspore that survives and will function in megagametophyte development.