unicellular

adjective

uni·​cel·​lu·​lar ˌyü-ni-ˈsel-yə-lər 

: having or consisting of a single cell

unicellular microorganisms

Examples of unicellular in a Sentence

Recent Examples on the Web

The microscopic unicellular parasite Cyclospora cayetanensis is behind the cases, causing a disease called cyclosporiasis. — Beth Mole, ArsTechnica, 7 July 2026

Secondary endosymbiosis, on the other hand, refers to the internalization of a unicellular organism that already possesses organelles formed through primary endosymbiosis. — Encyclopedia Britannica, 18 June 2026

To uncover this, a new analytical method was designed to compare gene expression profiles across diverse animal lineages and unicellular organisms. — Mrigakshi Dixit, Interesting Engineering, 25 May 2026

Diverse eukaryotic lineages, from unicellular eukaryotes to plants and animals, have repeatedly borrowed, adapted, and lost defenses from this arsenal over evolutionary time. — Viviane Callier, Quanta Magazine, 15 Apr. 2026

Word History

First Known Use

1858, in the meaning defined above

Rhymes for unicellular

• extracellular
• intercellular
• intracellular
• multicellular
• acellular
• subcellular
• cellular
• hepatocellular

Kids Definition

unicellular

adjective

uni·​cel·​lu·​lar ˌyü-ni-ˈsel-yə-lər 

: having or consisting of a single cell

unicellular microorganisms

Medical Definition

unicellular

adjective

uni·​cel·​lu·​lar ˌyü-ni-ˈsel-yə-lər 

: having or consisting of a single cell

unicellular microorganisms

unicellularity

-ˌsel-yə-ˈlar-ət-ē 

noun

plural unicellularities