Definitions

1. noun

a kingdom of eukaryotic microorganisms, including protozoa and algae, that are typically single-celled and have no cell wall.

“Some researchers study the various types of protista that live in freshwater environments.”

2. noun

a eukaryotic microorganism that belongs to the kingdom Protista.

“The protista in the pond were very diverse and included several different species of algae.”