An Etymological Dictionary of Astronomy and Astrophysics

Any device that halts or regulates the flow of a fluid through a passage, pipe, etc.

Etymology (EN): From L. valvae “leaves of a door.”

Etymology (PE): Daricé, leterally “small door, window,” → stop. Supâp, loan from Fr. soupape, from O.Fr. sourpape, probably from souspape “a blow under chin,” from sous “under,” from L. subtus, → sub-,

• *pape “jaw,” from paper, from L. pap(p)are “to eat.”