having three valves, as a shell.
a trivalve shell.
Origin of trivalve
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for trivalve
Historical Examples of trivalve
There is, however, an instrument similar to these trivalve instruments in the museum at Athens.Surgical Instruments in Greek and Roman Times
John Stewart Milne