tributary

A stream that flows into a larger stream or other body of water.

A ruler or nation that pays tribute.

Making additions or yielding supplies; contributory.

Paid in tribute.

Paying tribute.

Paying tribute; taxed or assessed by tribute.

Of the nature of tribute; paid or due as tribute.

Bringing accretions, supplies, aid, or the like; contributory; auxiliary; subsidiary; specifically, of streams, affluent.

A person or a state that pays tribute; one who or that which pays a stated sum to a conquering power, in acknowledgment of submission, or for the purchase of peace, security, and protection.

In geography, an affluent; a river or other body of water which contributes its stream to another river, etc.