1. Below the tongue. 2. Relating to the twelfth cranial nerve, nervus hypoglossus. SYN: hypoglossus. [L. hypoglossus fr. hypo- + glossus, tongue]
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hy·po·glos·sal .hī-pə-'gläs-əl adj of or relating to the hypoglossal nerves
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hy·po·glos·sal (hi″po-glosґəl) sublingual.Medical dictionary. 2011.