pseudoperculum
/ˌs(j)uːdə(ʊ)ˈpəːkjʊləm/(also pseudo-operculum) Chiefly Zoology
noun
A part of an animal (or plant) structure which forms or resembles a lid but is distinct from an operculum; (in gastropod molluscs) an epiphragm.
Origin
Late 19th century; earliest use found in The Century Dictionary. From post-classical Latin pseudoperculum from pseudo- + operculum.