embryo sac

noun Botany.

the megaspore of a seed-bearing plant, situated within the ovule, giving rise to the endosperm and forming the egg cell or nucleus from which the embryo plant develops after fertilization.

Origin of embryo sac

First recorded in 1870–75

Words nearby embryo sac

embryonization, embryonoid, embryony, embryopathy, embryoplastic, embryo sac, embryotomy, embryotoxic, embryotoxicity, embryotoxon, embryo transfer

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for embryo sac

One of the cells of the nucleus near its apex then enlarges, so as to form a sac, called the embryo-sac.
An Elementary Text-book of the Microscope|John William Griffith
And he observed the extension of the embryo-sacs up the style and the union of the pollen tube with the tip of the embryo-sac.
Makers of British Botany; a collection of biographies by living botanists|Various
But the formation of the macrospore or embryo-sac is simpler than the corresponding process in cryptogams.
Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886|Various
He also recognised and figured the great prolongation backwards of the embryo-sac as an empty, absorbent caecum.
Makers of British Botany; a collection of biographies by living botanists|Various

The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1|Various

British Dictionary definitions for embryo sac

embryo sac

noun

the structure within a plant ovule that contains the egg cell: develops from the megaspore and contains the embryo plant and endosperm after fertilization

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for embryo sac

embryo sac

An oval structure within an ovule of an angiosperm that contains the egg. Together with the fertilized egg, it develops into a seed. The embryo sac is the female gametophyte of angiosperms, consisting of eight nuclei: the egg and two adjacent and short-lived synergids that are near the micropyle (the opening where the pollen nuclei will enter), two central nuclei (which will combine with one of the pollen nuclei to form the endosperm), and three antipodal nuclei at the end of the embryo sac opposite the micropyle. Like the synergids, these nuclei degenerate at or shortly after fertilization. See more at gametophyte pollination.

单词	embryo sac
释义	embryo sac noun Botany. the megaspore of a seed-bearing plant, situated within the ovule, giving rise to the endosperm and forming the egg cell or nucleus from which the embryo plant develops after fertilization. Origin of embryo sac First recorded in 1870–75 Words nearby embryo sac embryonization, embryonoid, embryony, embryopathy, embryoplastic, embryo sac, embryotomy, embryotoxic, embryotoxicity, embryotoxon, embryo transfer Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for embryo sac One of the cells of the nucleus near its apex then enlarges, so as to form a sac, called the embryo-sac. An Elementary Text-book of the Microscope\|John William Griffith And he observed the extension of the embryo-sacs up the style and the union of the pollen tube with the tip of the embryo-sac. Makers of British Botany; a collection of biographies by living botanists\|Various But the formation of the macrospore or embryo-sac is simpler than the corresponding process in cryptogams. Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886\|Various He also recognised and figured the great prolongation backwards of the embryo-sac as an empty, absorbent caecum. Makers of British Botany; a collection of biographies by living botanists\|Various The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1\|Various British Dictionary definitions for embryo sac embryo sac noun the structure within a plant ovule that contains the egg cell: develops from the megaspore and contains the embryo plant and endosperm after fertilization Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for embryo sac embryo sac An oval structure within an ovule of an angiosperm that contains the egg. Together with the fertilized egg, it develops into a seed. The embryo sac is the female gametophyte of angiosperms, consisting of eight nuclei: the egg and two adjacent and short-lived synergids that are near the micropyle (the opening where the pollen nuclei will enter), two central nuclei (which will combine with one of the pollen nuclei to form the endosperm), and three antipodal nuclei at the end of the embryo sac opposite the micropyle. Like the synergids, these nuclei degenerate at or shortly after fertilization. See more at gametophyte pollination. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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