1. having spines or spine-like projections; thorny
Usage: often used in botanical contexts
2. relating to or resembling a spine or backbone
Usage: anatomical; medical

Examples

• The spinous cactus made it difficult to approach without gloves.
• Roses have spinous stems that can scratch unwary gardeners.
• The spinous process of the vertebra was clearly visible on the X-ray.
• Many desert plants develop spinous leaves as protection from herbivores.
• The doctor examined the spinous structures of the patient’s spine.
• Sea urchins are known for their spinous exterior covering.