Operculum

Definition

A lid or flap covering, often used to describe the closure that protects the entrance to the book lung of certain arachnids like scorpions, and also refers to various protective structures in other invertebrates.

Etymology

From Latin 'operculum', meaning 'cover' or 'lid'.

Example

The operculum in scorpions acts as a protective cover for the openings to their respiratory system.

Synonyms

• Lid
• Cover

Related Terms

• Book lung
• Scorpion
• Respiratory system

Usage Notes

The term 'operculum' is also used in other contexts outside arachnology and entomology, such as with certain mollusks and fish, but its function as a protective cover is a consistent theme.