occludent
/əˈkluːd(ə)nt/noun
Something that occludes; an occluder. rare.
adjective
Zoology. Having the function of, involved in, or undergoing closure or occlusion; specifically designating the edges of the opercular plates of a barnacle which come into contact when the aperture is closed.
Origin
Mid 18th century; earliest use found in Laurence Sterne (1713–1768), writer and Church of England clergyman. As noun from post-classical Latin occludent-, occludens a thing that occludes, use as noun of neuter singular of classical Latin occlūdēns. As adjective from classical Latin occlūdent-, occlūdēns, present participle of occlūdere.