Ro

Symbol

 * 1)  ;  element 86
 * 2)  ;  radon-222

Usage notes

 * The current symbol for this isotope and element is.

Proper noun

 * 1) An a priori international auxiliary language created by Edward Powell Foster beginning in 1904.

Romanization

 * 1)  Russian, Russian, Russo- (abbreviation)
 * 2)  Russian, Russian, Russo- (abbreviation)

Etymology
From, , from , from.

Noun

 * 1) calm, relative quietness
 * 2) calmness, serenity
 * 3) rest, repose