estuary
ES-choo-air-ee
/ˈestʃuəri/
The tidal mouth of a large river, where the tide meets the stream.
Characterized by 'brackish' water (a mix of fresh and salt water).
The story behind the word. Derived from the Latin 'aestus', meaning the tide or the surging of the sea (literally 'boiling'). It describes the turbulent place where the river's flow meets the ocean's tide.
Word relationships
- inlet: A generic term for a narrow body of water reaching into land.
- firth: A Scottish term for an estuary or sea inlet.
Commonly confused with
- delta: A delta is a landform made of sediment at a river mouth; an estuary is the water-filled mouth itself.
Collocations
- estuary mouth
- river estuary
- estuary habitat
Example sentences
- "The Thames Estuary is a vital shipping route and a rich habitat for birds." Geographical description.
- "Estuaries are among the most productive ecosystems on Earth." Ecological study.
Memory hook
'Estuary' sounds like 'S-tuary'—where Salt and Stream meet. Estuary: Where river meets sea.
When not to use
Do not use for a river mouth that does not have significant tidal influence or salt mixing.
Fun facts
- Estuaries are often called 'nurseries of the sea' because many species lay their eggs there.
Take your vocabulary further with LangBlitz
Our English vocabulary app: FSRS spaced repetition, 5,000+ curated words across 119 topic groups, CEFR A1 to C2. Explore your mastery with the beautiful Vocabulary World feature.