The New Student's Reference Work/Thorn
|←Thoreau, Henry David||The New Student's Reference Work (1914)
|Thorwaldsen, Albert Bertel→|
|See also Thorns, spines, and prickles on Wikipedia, and the disclaimer.|
Thorn, a conspicuous rigid and sharp structure of plants. Thorns may be transformed leaves or branches, and are most extensively developed by plants of the arid regions.