single celled

/ˈsɪŋɡəl sɛld/
adjective
  1. Describing an organism that consists of only one cell.
    • Amoebas are single-celled organisms that live in water.
    • Scientists study single-celled life to understand how more complex organisms evolved.
    • Bacteria are single-celled and can be found almost everywhere on Earth.
Synonyms