termen

Definition

The outer margin of an insect's wing, typically referring to the edge opposite the body in lepidopteran wings.

Etymology

Derived from Latin 'terminus', which means 'boundary' or 'end'.

Example

The termen of the butterfly's forewing is often rounded, while the hindwing can be scalloped.

Synonyms

• Wing margin
• Outer edge

Related Terms

• Costa
• Wing
• Lepidoptera

Usage Notes

The termen is a critical part of wing structure and can vary greatly among different species of insects.