Main entry: spinous, spiny
Definition: having spines
Usage: the dorsal fin is spinous
Antonyms: spineless
Definition: lacking spiny processes
Main entry: barbed, barbellate, thorny, setaceous, setose, spiny, briary, briery, bristled, bristly, burred, burry, prickly
Definition: having or covered with protective barbs or quills or spines or thorns or setae etc.
Usage: a horse with a short bristly mane; bristly shrubs; burred fruits; setaceous whiskers
Antonyms: unarmed
Definition: (used of persons or the military) not having or using arms
Antonyms: unarmed
Definition: (used of plants or animals) lacking barbs or stings or thorns
Antonyms: armless
Definition: having no arms