Emily Dickinson Lexicon

STRON'TIAN, n. [from Strontian, in Argyleshire, where it was first found.]

An earth which, when pure and dry, is perfectly white, and resembles baryte in many of its properties. It is a compound of oxygen and a base to which is given the name strontium, in the proportion of 16 per cent of the former, to 84 per cent, of the latter. – Davy.