RhymeZone: multivalve definitions

Definitions of multivalve:

adjective: (internal combustion engines) Having multiple intake valves and multiple exhaust valves per cylinder (typically two of each instead of one of each).
adjective: (anatomy, zoology, medicine) Having multiple biological valves.
adjective: (anatomy, zoology, medicine) Involving multiple heart valves.
noun: (zoology) A multivalve mollusc.

(Definitions from Wiktionary)