The word tributary refers to branch of river that flows into a main stream. It is a smaller unit or a river that flows into a larger one and feeds it. The word tributary may also be used to mean that which pays tribute to something.
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what does tributary mean
NOUN [PLURAL TRIB·U·TAR·IES.]
a stream that flows to a larger stream or other body of water.
a person or nation that pays tribute in acknowledgment of subjugation or the like.
(of a stream) flowing into a larger stream or other body of water.
Tributaries means making additions or yielding supplies or contributory. It is also used to define a stream that flows into a larger stream or other body of water. The term can also be used in reference to a ruler or nation that pays tribute.