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  • cyanobacteria
    cyanobacteria
    plural noun
    a widely distributed group of photosynthetic bacteria, occurring singly or in colonies in terrestrial and aquatic habitats: often mistakenly referred to as algae, especially when called by their most common misnomer, blue-green algae .
  • Cyanobacteria
    Cyanobacteria
    noun
    the phylum, or subkingdom, that comprises the cyanobacteria.

cyanobacteria

1 American  
[sahy-uh-noh-bak-teer-ee-uh, sahy-an-oh-] / ˌsaɪ ə noʊ bækˈtɪər i ə, saɪˌæn oʊ- /

plural noun

  • cyanobacterium
    singular
  1. Microbiology. a widely distributed group of photosynthetic bacteria, occurring singly or in colonies in terrestrial and aquatic habitats: often mistakenly referred to as algae, especially when called by their most common misnomer, blue-green algae .


Cyanobacteria 2 American  
[sahy-uh-noh-bak-teer-ee-uh, sahy-an-oh-] / ˌsaɪ ə noʊ bækˈtɪər i ə, saɪˌæn oʊ- /

noun

Microbiology.
  1. the phylum, or subkingdom, that comprises the cyanobacteria.


cyanobacteria British  
/ ˌsaɪənəʊbækˈtɪərɪə /

plural noun

  1. Former name: blue-green algae. a group of photosynthetic bacteria (phylum Cyanobacteria ) containing a blue photosynthetic pigment

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of cyanobacteria1

First recorded in 1975–80; cyano- 1 + bacteria

Origin of Cyanobacteria2

See cyanobacteria ( def. )


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

He found that Anabaena and some related cyanobacteria contain a system known as ParMR encoded within their chromosomes.

From Science Daily ● Apr. 20, 2026

Even today, cyanobacteria remain essential to life on Earth.

From Science Daily ● Apr. 20, 2026

The findings suggest that soon after cyanobacteria began producing oxygen, other organisms evolved the machinery to consume it.

From Science Daily ● Feb. 18, 2026

The beauty of the sky contrasts sharply with the water, sometimes blue, but often a murky green from cyanobacteria or stained black.

From BBC ● Jan. 29, 2026

"Understanding stress-responsive biosynthesis in extremophilic cyanobacteria may accelerate industrial biotechnology for natural pigment and antioxidant production," says Prof. Kageyama when describing the motivation behind the work.

From Science Daily ● Jan. 13, 2026

Cyanobacteria are photosynthetic bacteria that produce oxygen and are known for their ability to survive in harsh environments.

From Science Daily ● Jan. 13, 2026

Cyanobacteria, an ancient lineage of bacteria that perform photosynthesis, have been found to regulate their genes using the same physics principle used in AM radio transmission.

From Science Daily ● Nov. 25, 2024

This is in contrast to earlier studies that concluded that Cyanobacteria acquired these genes from Alphaproteobacteria at a late stage in their evolution.

From Science Daily ● Oct. 27, 2023

Before that, 2-methylhopanoids were thus only produced by Cyanobacteria.

From Science Daily ● Oct. 27, 2023

Cyanobacteria are photosynthesizers, while Actinobacteria are a group of very common bacteria that include species important in decomposition of organic wastes.

From Textbooks ● Jan. 1, 2015

The other is Chroococcidiopsis, a tough cyanobacterium that can survive extreme environments, including simulated Martian conditions.

From Science Daily ● Jan. 6, 2026

The two are forever on the trail of these composite symbiotic organisms, which they describe in the book as “an intensive cooperation between a fungus and an alga or a cyanobacterium, and sometimes all three.”

From Seattle Times ● Nov. 22, 2021

Some 2 billion years ago, a single-celled organism in Earth’s primeval ocean engulfed a mitochondrion and a cyanobacterium — and, now able to generate energy and photosynthesize, shunted off to change the world.

From Nature ● Apr. 2, 2019

But Chisholm has found hidden complexity within Prochlorococcus, a cyanobacterium that is the smallest, most abundant photosynthesizing cell in the ocean—responsible for 5% of global photosynthesis, by some estimates.

From Science Magazine ● Mar. 9, 2017

In contrast, the other algae—red, brown, golden, stramenopiles, and so on—all became photosynthetic by secondary, or even tertiary, endosymbiotic events; that is, they endosymbiosed cells that had already endosymbiosed a cyanobacterium.

From Textbooks ● Jan. 1, 2015

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