The term "labial pipe" refers to a type of musical instrument that generates sound by using airflow through a pipe that has a thin edge that vibrates. This edge is called the labium, and it is responsible for creating the sound. There are many synonyms for this type of instrument, including "lip-reed instrument," "aerophone," "wind instrument," and "flute." Each of these terms refers to different aspects of the labial pipe's design and construction. For example, "aerophone" refers to any instrument that produces sound through the use of air, while "flute" refers specifically to an instrument that has a cylindrical tube and no reed.