Definitions

1. noun

A layer of cuticle or epidermis in a plant, especially the innermost layer.

“The botanist carefully examined the extine of the plant to determine its species.”

2. noun

The outermost layer of the shell of a brachiopod.

“The paleontologist studied the extine of the fossilized brachiopod to learn about its evolution.”

3. noun

The external layer of the scales of a fish, especially the layer that lies next to the epidermis.

“The ichthyologist examined the extine of the fish to understand its skin structure.”