spirogyra
noun
spi·ro·gy·ra ˌspī-rə-ˈjī-rə 
: any of a genus (Spirogyra) of freshwater green algae with spiral chloroplasts
Example Sentences
Recent Examples on the Web Specialists reckon that human run-off contributed to the lake’s latest crisis: the sudden and widespread appearance of a new form of algae, spirogyra. 
The Economist, 22 Feb. 2018
The Economist, 22 Feb. 2018 Word History
Etymology
borrowed from New Latin Spirogyra, genus name, from Latin spīra "coil, twist, whorl" + Greek -o- -o- + gȳrá, feminine of gȳrós "curved, rounded" — more at spire entry 3, gyre entry 1
Note: The genus was introduced by the German botanist Johann Heinrich Friedrich Link (1767-1851) in "Epistola de algis aquaticis in genera disponendis," Horae physicae Berolinensis collectae ex symbolis virorum doctorum, edited by Christian Nees von Esenbeck (Bonn, 1820), p. 5
First Known Use
1875, in the meaning defined above
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