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Answer for the clue "A motile male gamete of a plant such as an alga or fern or gymnosperm ", 12 letters:
spermatozoid

Word definitions for spermatozoid in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Spermatozoid \Sper`ma*to*zo"id\, n. [Spermatozo["o]n + Gr. e'i^dos form.] (Biol.) The male germ cell in animals and plants, the essential element in fertilization; a microscopic animalcule-like particle, usually provided with one or more cilia by which ...

WordNet Word definitions in WordNet
n. a motile male gamete of a plant such as an alga or fern or gymnosperm [syn: antherozoid ]

Wiktionary Word definitions in Wiktionary
n. (context biology English) A motile, ciliated male gamete produced in the antheridium of an alga, fern or gymnosperm.

Usage examples of spermatozoid.

When mature the antheridium opens on being moistened and the spermatozoids become free in the water by the dissolution of the mucilaginous cell-walls enclosing them.