1. Full of spines: thorny.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• acinnous,
• aginous,
• aganous,
• apivorus,
• sapandus,
• spikmoss,
• spinoss,
• spinosse,
• spinoses,
• spinos,
• spienose,
• spinouse,
• spinus,
• spinouss,
• spynous,
• spinuus,
• spinuss,
• spynus,
• spyrous,
• epigous

• spaying,
• spenser,
• spinose,
• Sponsler,
• spumous,
• sponsor,
• Sponaugle,
• spinus,
• Spink,
• spang,
• spunk,
• spinoza,
• spank,
• spanish,
• spinosa,
• Spong,
• spinster,
• spinks,
• spanos.

The adjective form of the word "spinous" is "spiny".

The plural form of the word "spinous" is "spinous".

The singular form of the word "spinous" is "spine"