equipped with identical valves (as with the bivalve mollusc)
equivalve in American English
(ˈikwəˌvælv)
adjective
(of a bivalve mollusk)
having the valves of the shell equal in shape and size
Word origin
[1860–65; equi- + valve]This word is first recorded in the period 1860–65. Other words that entered Englishat around the same time include: big brother, blind spot, jumping jack, mutualism, pop-upequi- is a combining form meaning “equal,” used in the formation of compound words. Otherwords that use the affix equi- include: equicaloric, equilibrium, equipotential, equiprobabilism, equirotal