a Roman Catholic devotion in which the Blessed Sacrament is exposed for veneration for 40 hours by the churches of a diocese sequentially for two-day periods.
The Oldest Abbreviations In EnglishIn the age of LOL, WTF, and OMG, abbreviations are often looked at as a sign of the coming apocalypse. (Spoiler: LOL, WTF, and OMG are not the oldest abbreviations in English—you're shocked, we know.)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for forty hours
The next day saw us on board the little Arizona, bound for San Pedro, a forty-hours' trip down the coast.Adventures in Many Lands|Various