1. the series of bones forming the backbone of vertebrates
Usage: plural of spine
2. sharp pointed parts on plants or animals used for protection
Usage: plural of spine
3. the narrow backs of books where the title is printed
Usage: plural of spine

Examples

• The doctor examined the X-rays of both patients’ spines.
• Curved spines can cause back pain and posture problems.
• The cactus has sharp spines that protect it from animals.
• Porcupines use their spines as a defense mechanism.
• She arranged the books so their spines faced outward.
• The library’s old books had cracked spines from years of use.
• Sea urchins are covered in protective spines.