Definition of spirogyra in US English:

spirogyra

noun

Botany
  • A filamentous freshwater green alga containing spiral bands of chloroplasts.

    Genus Spirogyra, division Chlorophyta

    • ‘It was a picture of spirogyra, a single cell organism, taken through a microscope.’
    • ‘The magnified parade of protozoas, amoeba proteus and paramecia aurelia, with spirogyras and volvox green algae, amazed the kids.’
    • ‘The spirogyras send their contents through the conjugations tubes to the other one.’

Origin

Modern Latin, from spiro- ‘spiral’ + Greek guros, gura ‘round’.

Pronunciation

spirogyra

/ˌspīrəˈjīrə/