An Etymological Dictionary of Astronomy and Astrophysics

The temperature at which a liquid changes to a gas (vapor) at normal atmospheric pressure. In other words, the temperature at which the vapor pressure of a liquid is equal to the external pressure.

Etymology (EN): M.E. boillen; O.Fr. boillir, from L. bullire “to bubble, seethe,” from bulla “a bubble, knob;” → point.

Etymology (PE): Noqté, → point; juš “boiling,” present stem of jušidan “to boil;” Khotanese jis- “to boil;” Av. yaēšiiant- “boiling;” cf. Skt. yas- “to boil, become hot,” yasyati “boils, seethes;” Gk. zein “to bubble, boil, cook;” O.H.G. jesan “to ferment, foam;” Ger. Gischt “foam, froth,” gären “to ferment;” O.E. gist; E. yeast.