blue-green
Americannoun
Etymology
Origin of blue-green
First recorded in 1850–55
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.
A spokesperson for Armagh City, Banbridge and Craigavon Borough Council said watersports activities and open-water swimming at Craigavon Lakes were suspended on 21 July due to the presence of blue-green algae.
From BBC ● Jul. 26, 2026
In recent years, large blooms of potentially toxic blue-green algae in Lough Neagh – caused in part by long-term pollution – have grabbed the headlines.
From BBC ● Jul. 14, 2026
The natural option, a blue-green microalgae called spirulina, proved to be too costly and thick in consistency, causing factory equipment to clog during candy production.
From Salon ● Jun. 29, 2026
Instead of the previous blue-green algae, the new green algae is "just taking over," Paerl said.
From Barron's ● Jun. 21, 2026
But life did not evolve much beyond blue-green algae for three billion years, which suggests that large lifeforms with specialized organs are hard to evolve, harder even than the origin of life.
From "Cosmos" by Carl Sagan
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
