Tributary
/trˈɪbjəˌtɛri/
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Definition
(noun) A natural water stream that flows into a larger river or other body of water.
Sentence Examples
During the 15th century, the Ryukyu Kingdom was a tributary state of Imperial China.
The Oste is a tributary of the River Elbe.
CEFR Practice Quiz
A small ____ flows into the main river, increasing the volume of water after the heavy rain.