English
pseudoperculum
pseudo- + operculum, since it resembles an operculum but is not a permanent structure.
Today it means
noun An epiphragm.
Sources
Sources: Wiktionary, “pseudoperculum”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / pseudoperculum