tributary
noun
[ ˈtrɪbjʊt(ə)ri ]
• a river or stream flowing into a larger river or lake.
• "the Illinois River, a tributary of the Mississippi"
• a person or state that pays tribute to another state or ruler.
• "tributaries of the Ottoman Empire"
Origin:
late Middle English (in tributary (sense 2)): from Latin tributarius, from tributum (see tribute). tributary (sense 1) dates from the early 19th century.
