macrospore

American  

[mak-ruh-spawr, -spohr] / ˈmæk rəˌspɔr, -ˌspoʊr /

noun

Botany.

1. megaspore.

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macrospore British  

/ ˈmækrəʊˌspɔː /

noun

1. another name for megaspore

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Other Word Forms

• macrosporic adjective

Etymology

Origin of macrospore

First recorded in 1855–60; macro- + -spore

Example Sentences

L, young plant, with the attached macrospore, × 6. r, the first root. l, the first leaves.

From Elements of Structural and Systematic Botany For High Schools and Elementary College Courses by Campbell, Douglas Houghton

But the formation of the macrospore or embryo-sac is simpler than the corresponding process in cryptogams.

From Scientific American Supplement, No. 531, March 6, 1886 by Various

It arises by a simple enlargement of one cell of the nucleus instead of by the division of one cell into four, each thus becoming a macrospore.

From Scientific American Supplement, No. 531, March 6, 1886 by Various

The germination of the macrospore consists in the repeated division of its nucleus to form two groups of four, one group at each end of the embryo-sac.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various

In the full-grown ovule the macrospore, which in the seed plants is generally known as the “embryo sac,” is completely filled with the prothallium or “endosperm.”

From Elements of Structural and Systematic Botany For High Schools and Elementary College Courses by Campbell, Douglas Houghton