oospore

[oh-uh-spawr, -spohr]

noun

Biology.

1. a fertilized egg within an oogonium.

oospore

/ ˈəʊəˌspɔː /

noun

1. a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi

oospore

1. A fertilized female cell or zygote, especially one with thick chitinous walls, developed from a fertilized oosphere.

Other Word Forms

• oosporic adjective
• oosporous adjective

Word History and Origins

Origin of oospore¹

First recorded in 1860–65; oo- + -spore

Example Sentences

L, M, N, Fertilization of the oogonium and development of the oospore in Peronospora.

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The oospores give rise to neuter plants, the tetraspores to ♂ or ♀ plants.

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The oospores of the Saprolegniæ, when arrived at maturity, possess a tolerably thick double integument, consisting of an epispore and an endospore.

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After impregnation the fertilized oosphere immediately surrounds itself with a cell-wall and becomes the oospore which by a process of growth forms the embryo of the new plant.

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After the production of this oospore the parent filament gradually loses its vitality and slowly decays.

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