Roche-alum
noun, Chemistry.
1.
an alumlike substance derived from alunite.
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- Roche-limit
noun, Astronomy. 1. the minimum distance below which a moon orbiting a celestial body would be disrupted by tidal forces or below which a moon would not have formed. noun 1. (astronomy) the distance from the centre of a body, such as a planet, at which the tidal forces are stronger than the mutual gravitational […]
- Rochelle
noun 1. La. La Rochelle. 2. a female given name: from a French word meaning “small rock.”. noun 1. a seaport in and the capital of Charente Maritime, in W France; besieged while a Huguenot stronghold 1627–29. noun 1. a port in W France, on the Bay of Biscay: a Huguenot stronghold until its submission […]
- Rochelle powder
/rɒˈʃɛl/ noun 1. another name for Seidlitz powder
- Rochelle-powders
noun 1. (not in technical use) Seidlitz powders.
- Rochelle-salt
noun, Chemistry, Pharmacology. 1. a colorless or white, water-soluble solid, KNaC 4 H 4 O 6 ⋅4H 2 O, used in silvering mirrors, in the manufacture of Seidlitz powders and baking powder, and in medicine as a laxative. Rochelle salt noun 1. a white crystalline double salt, sodium potassium tartrate, used in Seidlitz powder. Formula: […]