Labionasal has the following meanings in the field of medicine:

1. Pertaining to the upper lip (or both lips) and the nose.

2. Indicating certain letters of the alphabet or sounds of speech that are formed by both the lips and the nose. Labionasal comes from the Latin word "labium" meaning "lips," and the Latin word "nasus" meaning "nose." Put the two words together and you have "lips (and) nose."

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