Learn how to say Tributaries correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word tributary:
noun (plural tributaries)
1a river or stream flowing into a larger river or lake:
the Illinois River, a tributary of the Mississippi
2 historical a person or state that pays tribute to another state or ruler:
tributaries of the Ottoman Empire
late Middle English (in sense 2): from Latin tributarius, from tributum (see tribute). sense 1 dates from the early 19th century