Lingual (adjective)

1. Of or relating to the tongue.
2. Of or relating to language or speech.

Origin:

From latin lingua "tongue".

Examples:

1. The lingual surface of the tooth is the side that faces the tongue.
2. Lingual braces are placed behind the teeth, making them invisible.
3. Lingual language learning refers to the process of learning a new language through listening and speaking.
4. The lingual nerve provides sensation to the tongue and the floor of the mouth.
5. The lingual side of the tooth is on the side facing the tongue.