An Etymological Dictionary of Astronomy and Astrophysics

The total liquid product of precipitation or condensation from the atmosphere, as received and measured in a rain gauge.

Etymology (EN): → rain + → fall.

Etymology (PE): Bâreš verbal noun of bâridan “to rain,” bâridan “to rain;”
Mid.Pers. vârân “rain,” vâritan “to rain;” Av. vār- “rain; to rain;” cf.
Skt. vār- “rain, water; to rain;” L. urinari “to plunge under water, to dive;” Gk. ourein “to urinate;” PIE base *uer- “water, rain, river.”