confluent

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Flowing together; blended into one.
• adjective Merging or running together so as to form a mass, as sores in a rash.
• noun One of two or more confluent streams.
• noun A tributary.

from The Century Dictionary.

• Flowing together; meeting in their course, as two streams.
• In anatomy, having grown or become blended together, as two bones which were originally separate.
• In botany and zoology, blended into one: us, confluent leaves.
• In pathol: Running together: as, confluent pustules.
• Characterized by confluent pustules: as, confluent smallpox.
• Rich; affluent.
• noun A tributary stream: as, the Mohawk is a confluent of the Hudson.
• noun A joining or confluence, as of two streams.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Flowing together; meeting in their course; running one into another; flowing together to form a single stream.
• adjective (Bot.) Blended into one; growing together, so as to obliterate all distinction.
• adjective Running together or uniting, as pimples or pustules.
• adjective Characterized by having the pustules, etc., run together or unite, so as to cover the surface.
• noun A small steam which flows into a large one.
• noun obsolete The place of meeting of steams, currents, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Converging, merging into continuous shape (of two or more objects).
• adjective meteorology (Of wind) which converges, especially when viewed on a weather chart
• adjective biology Describing cells in a culture that merge to form a mass
• adjective geometry (Of a triangle) which is exactly the same size as another triangle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a branch that flows into the main stream
• adjective flowing together