ˌspīrəˈjīrə noun
Etymology: New Latin, from spir- + -gyra (from Greek gyros ring); akin to Greek gyros round — more at cower
1. capitalized : a genus of freshwater green algae (family Zygnemataceae) having spiral chlorophyll bands and forming slimy masses in still waters and slow streams
2. -s : any plant of the genus Spirogyra