Spine: an unsegmented bony process consisting of a single element, often sharp and pointed.

Spinous dorsal: the anterior dorsal fin which is supported by spines found in many fishes. (figure fish length).

Spinule, spinulose: a minute spine.

Spiny: slender and pointed like a spine, or covered and armed with spines. Also part of the common name of many fishes, like the Spiny eel, Spiny gurnard etc.

Alternative forms for spine : spinous dorsal, spinule, spinulose, spiny.