subspinous

from The Century Dictionary.

• Somewhat spinous or prickly; like a spine to some extent: as, subspinous hairs in the pelage of a mammal.
• Situated under (ventrad of) the spinal column; hypaxial with reference to the backbone; subvertebral.
• Situated or occurring below. beneath, or on the under side of a spine, as of a vertebra, or of the scapula: infraspinous: as, a subspinous muscle (the infraspinatus).

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Anat.) Subvertebral.
• adjective (Med.) Situated beneath a spinous process, as that of the scapula.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective anatomy subvertebral
• adjective medicine Situated beneath a spinous process, such as that of the scapula.