Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Botany The smaller of two types of spores that give rise to a male gametophyte.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small spore.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the exceedingly minute spores found in certain flowerless plants, as Selaginella and Isoetes, which bear two kinds of spores, one very much smaller than the other. Cf. macrospore.

from The Century Dictionary and Cyclopedia

  • n. In botany, an asexually produced spore of small size as compared with others produced by the same species: the homologue of the pollen-grain of phanerogams.
  • n. In zoology, one of the spore-like elements, of exceedingly minute size, but very numerous, produced through the encystment and subsequent subdivision of many monads.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte

Etymologies

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