IPA: /ˈɛpɪfræɡm/
KK: /ˈɛpɪfræɡm/
A layer of mucus that a snail or mollusk uses to close itself inside its shell, especially during hibernation, or a membrane that acts as a barrier in certain structures.
The snail created an epiphragm to protect itself from the cold during winter.
Epiphragm is formed from "epi-" (meaning upon or over) and "phragm" (from Greek "phragmos", meaning fence or barrier). The word refers to a barrier or partition that is placed over or upon something, often used in a scientific context to describe a membrane or structure that separates areas.
Think of something that is placed 'over' ('epi-') a 'fence' or 'barrier' ('phragm') — that's why an epiphragm is a type of barrier.