biosphere

noun

bio·​sphere ˈbī-ə-ˌsfir 

1

: the part of the world in which life can exist

2

: living organisms together with their environment

biospheric

ˌbī-ə-ˈsfir-ik 

-ˈsfer-, 

-ˈsfe-rik

adjective

Did you know?

The lithosphere is the solid surface of the earth (lith- meaning "rock"); the hydrosphere is the earth's water (hydro- means "water"), including the clouds and water vapor in the air; and the atmosphere is the earth's air (atmos- meaning "vapor"). The term biosphere can include all of these, along with the 10 million species of living things they contain. The biosphere recycles its air, water, organisms, and minerals constantly to maintain an amazingly balanced state; human beings should probably do their best to imitate it. Though the word has a new sound to it, it was first used over a hundred years ago.

Examples of biosphere in a Sentence

Recent Examples on the Web

During The Great Dying, massive volcanic eruptions triggered catastrophic climate changes that altered the planet’s entire biosphere. —Laura Baisas, Popular Science, 18 June 2026

Timed to coincide with World Environment Day on June 5, Canada's Québec City became the first whole city to be designated a biosphere reserve, according to UNESCO. —Kristine Hansen, Travel + Leisure, 17 June 2026

In addition to the ruins, the biosphere reserve is home to many species of flora and fauna and is worth visiting for wildlife alone, especially in the morning when monkeys, birds and other animals are most active. —Lauren Mowery, Forbes.com, 26 May 2026

The wetland spans about 428,000 hectares (1,600 square miles) of lagoons, mangroves and marshes — roughly the size of Los Angeles — and has been a UNESCO biosphere reserve since 2000. —ABC News, 12 May 2026

Word History

Etymology

borrowed from German Biosphäre, from bio- bio- + -sphäre -sphere

Note: Biosphäre was introduced by the Austrian geologist Eduard Suess (1831-1914) in Die Entstehung der Alpen (Vienna, 1875), p. 159.

First Known Use

1899, in the meaning defined at sense 1

Rhymes for biosphere

• headgear
• midyear
• nazir
• ophir
• reindeer
• switchgear
• tuyere
• acyclovir
• asthenosphere
• ganciclovir
• magnetosphere
• atmosphere

Kids Definition

biosphere

noun

bio·​sphere ˈbī-ə-ˌsfi(ə)r 

: the part of the world in which life can exist

Medical Definition

biosphere

noun

bio·​sphere ˈbī-ə-ˌsfi(ə)r 

1

: the part of the world in which life can exist

2

: living beings together with their environment