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Showing results for blue-green.
Definitions

blue-green

[bloo-green] / ˈbluˈgrin /
ADJECTIVE
blue
Synonyms
STRONG
azure beryl cerulean cobalt indigo navy royal sapphire teal turquoise ultramarine
WEAK
blue-gray
ADJECTIVE
green
Synonyms
STRONGEST
olive
STRONG
apple aquamarine beryl chartreuse fir forest grass jade kelly lime malachite moss pea peacock pine sage sap sea spinach verdigris willow
WEAK
bice greenish-blue vert viridian
NOUN
turquoise
Synonyms
STRONGEST
aquamarine
STRONG
color mineral
WEAK
greenish-blue sea-green

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.

Lough Neagh has been turned green for the past three summers, due to potentially toxic blue-green algal blooms.

From BBC • Apr. 15, 2026

Last year, scientists in the country announced they had launched successful trials spraying the soil with cyanobacteria, also known as "blue-green algae" -- a method that helps retain moisture and facilitate tree rooting.

From Barron's • Dec. 18, 2025

During the warm months, Lake Erie becomes an ideal setting for cyanobacteria, also known as blue-green algae, to grow rapidly.

From Science Daily • Dec. 2, 2025

Those sown in August are currently just tiny blue-green shoots.

From Los Angeles Times • Nov. 21, 2025

His skin radiated a reddish copper glow of tan, his brown hair had been a little bleached by the sun, and I noticed that the tan made his eyes shine with a cool blue-green fire.

From "A Separate Peace" by John Knowles