Spore formation
Spore Spore (sp[=o]r), n. [Gr. ? a sowing, seed, from ? to sow. Cf. {Sperm}.] 1. (Bot.) (a) One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species. [1913 Webster]

Note: Spores are produced differently in the different classes of cryptogamous plants, and as regards their nature are often so unlike that they have only their minuteness in common. The peculiar spores of diatoms (called {auxospores}) increase in size, and at length acquire a siliceous coating, thus becoming new diatoms of full size. Compare {Macrospore}, {Microspore}, {O["o]spore}, {Resting spore}, {Sph[ae]rospore}, {Swarmspore}, {Tetraspore}, {Zo["o]spore}, and {Zygospore}. [1913 Webster] (b) An embryo sac or embryonal vesicle in the ovules of flowering plants. [1913 Webster]

2. (Biol.) (a) A minute grain or germ; a small, round or ovoid body, formed in certain organisms, and by germination giving rise to a new organism; as, the reproductive spores of bacteria, etc. (b) One of the parts formed by fission in certain Protozoa. See {Spore formation}, belw. [1913 Webster]

{Spore formation}. (a) (Biol) A mode of reproduction resembling multiple fission, common among Protozoa, in which the organism breaks up into a number of pieces, or spores, each of which eventually develops into an organism like the parent form. --Balfour. (b) The formation of reproductive cells or spores, as in the growth of bacilli. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Spore — (sp[=o]r), n. [Gr. ? a sowing, seed, from ? to sow. Cf. {Sperm}.] 1. (Bot.) (a) One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species. [1913 Webster] Note: Spores are produced differently …   The Collaborative International Dictionary of English

  • spore — [ spɔr ] n. f. • 1817; gr. spora « semence » ♦ Biol. Corpuscule reproducteur de nombreuses espèces végétales et de certains protozoaires. ⇒ asque, baside, conidie, macrospore, microspore, zoospore; sporange, sporogone, sporophyte, sporulation.… …   Encyclopédie Universelle

  • Spore — Pour les articles homonymes, voir Spore (homonymie).  Pour l’article homophone, voir Sport …   Wikipédia en Français

  • Spore — For other uses, see Spore (disambiguation). Spores produced in a sporic life cycle. In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form… …   Wikipedia

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  • free cell formation — noun : a process of cell formation that is frequent in endosperm development and in spore formation in many fungi (especially ascomycetes) and in which successive nuclear divisions are followed by the nuclei each appropriating a portion of… …   Useful english dictionary

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  • auxospores — Spore Spore (sp[=o]r), n. [Gr. ? a sowing, seed, from ? to sow. Cf. {Sperm}.] 1. (Bot.) (a) One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species. [1913 Webster] Note: Spores are produced …   The Collaborative International Dictionary of English

  • plant development — Introduction       a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells (gametes (gamete)), contains two sets of similar chromosomes (diploid). At sexual… …   Universalium

  • bacteria — bacterial, adj. bacterially, adv. /bak tear ee euh/, n.pl., sing. bacterium / tear ee euhm/. ubiquitous one celled organisms, spherical, spiral, or rod shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom …   Universalium

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