[ meg-uh-guh-mee-tuh-fahyt ]
/ ˌmɛg ə gəˈmi təˌfaɪt /

noun Botany.

the female gametophyte in seed plants.


How Hip Is Your Lingo? Take Our Slang Quiz!
If you aren’t already skilled in slang, then this quiz can get you up to speed in no time!
Question 1 of 11
OK Boomer can be perceived as pejorative, but it is mostly considered to be _____

Origin of megagametophyte

First recorded in 1930–35; mega- + gametophyte

OTHER WORDS FROM megagametophyte

meg·a·ga·me·to·phyt·ic [meg-uh-guh-mee-tuh-fit-ik, -gam-i-] /ˌmɛg ə gəˌmi təˈfɪt ɪk, -ˌgæm ɪ-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for megagametophyte

[ mĕg′ə-gə-mētə-fīt′ ]

The female gametophyte that develops from the megaspores of heterosporous plants. Among heterosporous species of the lycophyte plants, for example, the sporophyte plant produces megaspores stocked with food. These spores grow into megagametophytes that produce eggs. After fertilization of the eggs, the embryos grow into new sporophytes inside the megagametophyte and are nourished by the food within it. In the seed plants, the megagametophyte generation is very small and lives its entire existence within the ovules of the sporophyte plant, where some of its cells become eggs, while others become food reserves for the resultant embryos. See more at alternation of generations gametophyte.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.