• synonyms


noun Botany.
  1. a widely distributed filamentous freshwater green alga of the genus Spirogyra.
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Origin of spirogyra

1895–1900; < New Latin, equivalent to spiro- spiro-2 + -gyra, alteration of Greek gŷros circle or gȳrós round
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for spirogyra

Historical Examples of spirogyra

  • Lindsay describes experiments carried on in a reservoir infested with Spirogyra.

    Inorganic Plant Poisons and Stimulants

    Winifred E. Brenchley

  • The number of these bands varies much in different species of Spirogyra, but is commonly two or three.

  • Each thread is a long tube, branching sometimes, but not divided into cells as in Spirogyra or Cladophora.

British Dictionary definitions for spirogyra


  1. any green freshwater multicellular alga of the genus Spirogyra, consisting of minute filaments containing spirally coiled chloroplasts
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Word Origin for spirogyra

C20: from New Latin, from spiro- ² + Greek guros a circle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

spirogyra in Science


  1. Any of a genus of filamentous freshwater green algae having cylindrically shaped cells with spiral-shaped bands of chloroplasts. Species of Spirogyra reproduce asexually by cell division and fragmentation and sexually by conjugation. They form green scum on ponds, floated by the oxygen produced by photosynthesis.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.