/ˌsiːənoʊˌfɪˈliːi/ (SEE-ə-noh-fih-LEE-ee)

Definitions

1. noun

A subkingdom of cyanobacteria, formerly classified as algae, characterized by photosynthetic activity, nitrogen fixation, and a wide range of ecological roles.

“The cyanophyceae are known to dominate aquatic ecosystems worldwide.”