(redirected from megagametophyte)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.


1. the ovum within the graafian follicle.
2. any small, egglike structure.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


(ov'yūl, ō'vū-),
1. The oocyte of a mammal, especially while still in the ovarian follicle.
2. A small beadlike structure bearing a fancied resemblance to an ovule.
Synonym(s): ovulum
[Mod. L. ovulum, dim. of L. ovum, egg]
Farlex Partner Medical Dictionary © Farlex 2012


(ŏv′yo͞ol, ō′vyo͞ol)
1. Botany A structure in seed plants that consists of the embryo sac surrounded by the nucellus and one or two integuments and that develops into a seed after it is fertilized.
2. Zoology A small or immature ovum.

ov′u·lar (ŏv′yə-lər, ō′vyə-), ov′u·lar′y (-lĕr′ē) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


1. The oocyte (ovum) of a mammal, especially while still in the ovarian follicle.
2. A small beadlike structure resembling an ovule.
Synonym(s): ovulum.
[Mod. L. ovulum, dim. of L. ovum, egg]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Ovuleclick for a larger image
Fig. 241 Ovule . General structure.


a structure found in higher plants that contains an egg cell and develops into a seed after FERTILIZATION. In ANGIOSPERMS, the ovule develops within the ovary of a carpel, and consists of an inner EMBRYO SAC containing the egg cell surrounded by the NUCELLUS, which in turn is enclosed within two INTEGUMENTS. The ovule is connected to the ovary wall by the FUNICLE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Patient discussion about ovule

Q. i just have my period last november 25 and ended on 28.when is my possible fertile and ovulation period please help me identify my fertile and ovulation period

A. If someone knew it, it'd solve the human race many problems with fertility. The problem is that ovulation (and thus, the period of possible fertility) happens 14 days BEFORE the onset of menses, so you know about it only retrospectively.

However there ways such as serial body temperature measuring, along with kits that measures the level of hormones in the urine in order to estimate the time of the coming ovulation, and help in timing intercourse.

You may read more about it here (www.mayoclinic.com/health/ovulation-signs/AN01521 ) but anyway, consulting a doctor (e.g. gynecologist) may be wise.

More discussions about ovule
This content is provided by iMedix and is subject to iMedix Terms. The Questions and Answers are not endorsed or recommended and are made available by patients, not doctors.
References in periodicals archive ?
polar nuclei: Two of the eight haploid nuclei of a megagametophyte that migrate, one from each end, to the middle of the embryo sac; two nucleifuse with a sperm nucleus during double fertilization.
Microscopic examination of cleared ovules of control genotypes contained features of mature megagametophytes of L.
In 1989, seeds were germinated for isozyme analysis, and when the radicles appeared through the seed coat, the megagametophytes and embryos were excised and separated.
A cluster diagram of the genetic relationships of all populations sampled, based on megagametophyte allozymes used in calculating chord distance (Cavalli-Sforza and Edwards 1967), shows that populations of coastal and pygmy-forest origin do not form the phylogenetic dichotomy expected with different subspecies or species.
Coordinated timetables for megagametophyte development and pollen tube growth in Rhododendron nuttallii from anthesis to early postfertilization.
possible to obtain somatic embryos of this species from megagametophyte
Higher rates of paternity exclusion can generally be achieved in outcrossing gymnosperms, in part because of their high levels of genetic polymorphism, but particularly because the female contribution to the seed can be unambiguously determined through the megagametophyte.
Studies of floral morphology in the Ericales, II: Megagametophyte development in the Andromedeae.
Coenocytic development of megagametophyte: 0 = absent; 1 = present.
Ovules solitary, terminal on short shoots, the shoots paired on an abbreviated branchlet in the axil of a foliage leaf near the base of the current year's branchlet, entirely surrounded by and nearly completely adnate to the thin aril, subtended by 4 short (1-3 mm long) sterile scales, one ovule of the paired shoots often not developing; arils ovoid-oblong, drupe-like, (1.5-)2-3.5(-5) cm long, purple or tinged green, resinous, ripening the second season; seeds hard, woody, nearly as large as the aril, megagametophyte smooth to slightly or deeply ruminated.
The megagametophyte in Anarthria (Anarthriaceae, Poales) and its implications for the phylogeny of the Poales.