spermatozoīds

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• spermatozoids — n. mature male reproductive cell produced in an antheridium (Botany) …   English contemporary dictionary

• cycadophyte — ▪ plant Introduction       any member of a diverse collection of mostly extinct primitive gymnospermous plants. They probably had their origins among the progymnosperms of the Devonian Period (416 to 359 million years ago), possibly among a… …   Universalium

• Thuret, Gustave-Adolphe — ▪ French botanist born May 23, 1817, Paris died May 10, 1875, Nice, Fr.       French botanist who gave the first accounts of fertilization in the brown algae.       After receiving a law degree in 1838, Thuret began to study botany under Joseph… …   Universalium

• Antheridia — Antheridium An ther*id i*um, n.; pl. {Antheridia}. [Anther + ? (a Gr. diminutive ending).] (Bot.) The male reproductive apparatus in the lower plants, consisting of a cell or other cavity in which spermatozoids are produced; called also… …   The Collaborative International Dictionary of English

• Antheridial — Antheridium An ther*id i*um, n.; pl. {Antheridia}. [Anther + ? (a Gr. diminutive ending).] (Bot.) The male reproductive apparatus in the lower plants, consisting of a cell or other cavity in which spermatozoids are produced; called also… …   The Collaborative International Dictionary of English

• Antheridium — An ther*id i*um, n.; pl. {Antheridia}. [Anther + ? (a Gr. diminutive ending).] (Bot.) The male reproductive apparatus in the lower plants, consisting of a cell or other cavity in which spermatozoids are produced; called also {spermary}. {An… …   The Collaborative International Dictionary of English

• Anthrophyta — Spermatophyta Sper ma*toph y*ta, n. pl. [NL.; spermato + Gr. ? plant.] (Bot.) A phylum embracing the highest plants, or those that produce seeds; the seed plants, or flowering plants. They form the most numerous group, including over 120,000… …   The Collaborative International Dictionary of English

• Cycadaceae — n. a natural family of ancient palmlike plants closely related to ferns in that fertilization is by means of spermatozoids. Syn: family {Cycadaceae}, cycad family. [WordNet 1.5] …   The Collaborative International Dictionary of English

• Ovotesttis — O vo*test tis, n. [NL. See {Ovum}, and {Testis}.] (Zo[ o]l.) An organ which produces both ova and spermatozoids; an hermaphrodite gland. [1913 Webster] …   The Collaborative International Dictionary of English

• Panerogamia — Spermatophyta Sper ma*toph y*ta, n. pl. [NL.; spermato + Gr. ? plant.] (Bot.) A phylum embracing the highest plants, or those that produce seeds; the seed plants, or flowering plants. They form the most numerous group, including over 120,000… …   The Collaborative International Dictionary of English

• Phaenogamia — Spermatophyta Sper ma*toph y*ta, n. pl. [NL.; spermato + Gr. ? plant.] (Bot.) A phylum embracing the highest plants, or those that produce seeds; the seed plants, or flowering plants. They form the most numerous group, including over 120,000… …   The Collaborative International Dictionary of English