Subglossal is a scientific term used to describe something that is located below the tongue. While it may not be a word used in everyday language, there are many synonyms that can be used in its place. Some of these synonyms include sublingual, hypoglossal, and sublingualis. These words all describe something located or positioned beneath the tongue. Additionally, the word infralingual is another synonym that specifically refers to the area below the tongue. Depending on the context in which subglossal is being used, there are a variety of other words that may also be used synonymously to convey the same or a similar meaning.