• WordNet 3.6
    • n spirogyra freshwater algae consisting of minute filaments containing spiral chlorophyll bands
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Century Dictionary and Cyclopedia
    • n spirogyra A genus of fresh-water algæ, of the class Conjugatæ and order Zygnemaceæ. They are among the commonest of fresh-water algæ, forming dense bright-green masses, in both running and stagnant water, and have often a slimy feel, owing to the well-developed mucilaginous sheath in which each filament is enveloped. The cells have one to several parietal chlorophyl-bands spirally winding to the right. Conjugation is scalariform or lateral. There are about 40 species and very many varieties in the United States. They are popularly called frog-spit or frog-spittle. See frog-spit, and cuts under chlorophyl and conjugation, 4.
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In literature:

The zygoblasts of conjugating algae, as in Spirogyra.
"Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886" by Various