hypoglossal

1. Of or relating to the area under the tongue.
2. Of or relating to the hypoglossal nerve.

[HYPO- + Greek glōssa, tongue.]

1. Of or relating to the area under the tongue.
2. Of or relating to the hypoglossal nerve.

Situated beneath the tongue, as the hypoglossal nerve.

• h. cord — the large aggregation of myogenic cells which migrates from somites 3–5 to a location ventral to the pharynx, and forms the tongue.
• h. nerve paralysis — causes difficulty in prehension, deglutition and mastication. Unilateral lesions cause deviation of the protruded tongue toward the side of the lesion.

The noun has one meaning:

Meaning #1: supplies intrinsic muscles of the tongue and other tongue muscles
  Synonyms: hypoglossal nerve, nervus hypoglosus, twelfth cranial nerve