Megaspore

[meg-uh-spawr, -spohr] /ˈmɛg əˌspɔr, -ˌspoʊr/

noun, Botany.
1.
the larger of the two kinds of characteristically produced by seed plants and a few fern allies, developing into a female gametophyte.
Compare .
2.
the embryo sac of a flowering plant.
/ˈmɛɡəˌspɔː/
noun
1.
Also called macrospore. the larger of the two types of spore produced by some spore-bearing plants, which develops into the female gametophyte Compare microspore (sense 1)
2.
the cell in flowering plants that gives rise to the embryo sac
n.

1857, from mega- + spore.
megaspore
(měg’ə-spôr)
One of the two types of haploid spores produced by a heterosporous plant. Megaspores develop into female gametophytes and are usually larger than microspores.

Read Also:

Megaspore-mother-cell
noun, Botany. 1. a diploid cell in plants that undergoes meiosis to create four haploid megaspores.
Megaspores
[meg-uh-spawr, -spohr] /ˈmɛg əˌspɔr, -ˌspoʊr/ noun, Botany. 1. the larger of the two kinds of characteristically produced by seed plants and a few fern allies, developing into a female gametophyte. Compare . 2. the embryo sac of a flowering plant. /ˈmɛɡəˌspɔː/ noun 1. Also called macrospore. the larger of the two types of spore produced […]
Megasporocyte
noun, Botany. 1. a diploid cell in plants that undergoes meiosis to create four haploid megaspores. megasporocyte (měg’ə-spôr’ə-sīt’) A diploid cell that undergoes meiosis to produce megaspores as part of megasporogenesis. Also called megaspore mother cell.

Megasporogenesis
[meg-uh-spawr-uh-jen-uh-sis, -spohr-] /ˌmɛg əˌspɔr əˈdʒɛn ə sɪs, -ˈspoʊr-/ noun, Botany. 1. the formation and development of megaspores. megasporogenesis (měg’ə-spôr’ə-jěn’ĭ-sĭs) The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a megasporocyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, […]
Megasporophyll
[meg-uh-spawr-uh-fil, -spohr-] /ˌmɛg əˈspɔr ə fɪl, -ˈspoʊr-/ noun, Botany. 1. a producing megasporangia only. /ˌmɛɡəˈspɔːrəfɪl/ noun 1. a leaf on which the megaspores are formed: corresponds to the carpel of a flowering plant Compare microsporophyll megasporophyll (měg’ə-spôr’ə-fĭl’) A leaflike structure that bears megasporangia.