One-celled

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Single-celled, unicellular. not-comparable

    "The first (oldest) unit of time is the Precambrian Supereon, which covers much of Earth's history from its origins roughly 4.55 bya to 545 mya. Very primitive, one-celled life-forms arose as early as 4.0 bya and near the end of the era (570 mya) the oldest known fossils of multi-celled organisms appear."

Adjective
  1. 1
    having a single cell (and thus not divided into cells) wordnet

Synonyms

All synonyms
single-celled

Example

More examples

"The microscopic, one-celled aquatic plants are known as essential primary-producers, which form the base of the food chain for sea life."

Etymology

From one + celled.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.