1. spinous - Adjective
2. spinous - Adjective Satellite
Spinose; thorny.
Having the form of a spine or thorn; spinelike.
Source: Webster's dictionarythe dorsal fin is spinous Source: Internet
The C2 to C7 vertebrae have foramina in each of the transverse processes and bifid spinous processes except for C7, which has a nonbifid and a prominent posterior spinous process that can be felt distinctly at the base of the neck. Source: Internet