con·flu·ent 
(kŏnfl-ənt)
(kŏnfl-ənt)adj.
1. Flowing together; blended into one.
2. Merging or running together so as to form a mass, as sores in a rash.
n.
1. One of two or more confluent streams.
2. A tributary.
[Middle English, from Latin cōnfluēns, cōnfluent-, present participle of cōnfluere, to flow together : com-, com- + fluere, to flow; see bhleu- in the Appendix of Indo-European roots.]