The New Student's Reference Work/Thorn
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.
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.