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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:

Among them, cyanobacteria stand out for producing the oxygen that filled our atmosphere and allowed complex life to emerge.

From Science Daily Apr. 20, 2026

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

From Science Daily Apr. 20, 2026

Multicellular cyanobacteria evolved gradually from single-celled ancestors, gaining complexity over time.

From Science Daily Apr. 20, 2026

Microbes living near cyanobacteria could have quickly absorbed the oxygen being released.

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

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

Cyanobacteria such as spirulina are already grown industrially in several countries -- mostly for health foods.

From Science Daily Feb. 27, 2024

For a long time, a certain type of fossil lipid, so-called 2-methylhopanes, was considered to be an important biomarker for Cyanobacteria in sediments, some of which are hundreds of millions of years old.

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

Cyanobacteria are able to use carbon dioxide as a source of carbon.

From Textbooks Apr. 25, 2013

These observations permitted to identify N majensis as a fossil cyanobacterium.

From Science Daily Jan. 5, 2024

The most feared—and studied—cause of these freshwater “algal” blooms is a genus of cyanobacterium called Microcystis.

From Science Magazine Jul. 5, 2022

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

Genetic and morphological studies suggest that plastids evolved from the endosymbiosis of an ancestral cell that engulfed a photosynthetic cyanobacterium.

From Textbooks Apr. 25, 2013

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