Definitions

1. adjective

Having spines or spine-like processes; spiny

“The spinous leaves of the plant provided protection from herbivores.”

2. adjective

Relating to or resembling the spine or backbone

“The spinous structure of the human skeleton is vital for support and protection.”

3. noun

The spiny or spine-like part of a vertebra, especially in the thoracic region

“The doctor examined the patient’s spinous process before performing the operation.”