Emily Dickinson Lexicon

THURS'DAY, n. [Dan. Torsdag, that is, Thor's day, the day consecrated to Thor, the god of thunder, answering to the Jove of the Greeks and Romans, L. dies Jovis; It. Giovedi; Sp. Jueves; Fr. Jeudi. So in G. donnerstag, D. donderdag, thunder-day. This Thor is from the root of W. taran, thunder; taraw, to strike, hit or produce a shock; Gaelic and Ir. toirn, a great noise; toirneas, thunder. The root of the word signifies to drive, to rush, to strike. In Sw. thördon is thunder.]

The fifth day of the week.