Definition of "multivalve"

Having or involving multiple valves (in any context); thus:

1. (internal combustion engines) Having multiple intake valves and multiple exhaust valves per cylinder (typically two of each instead of one of each).  examples

2. (anatomy, zoology, medicine) Having multiple biological valves.

3. (anatomy, zoology, medicine) Involving multiple heart valves.

(zoology) A multivalve mollusc.