Pronunciation: (lam'us), [key]
1. a former festival in England, held on August 1, in which bread made from the first harvest of corn was blessed.
2. a festival (Feast of St. Peter's Chains) observed by Roman Catholics on August 1, in memory of St. Peter's imprisonment and his miraculous deliverance. Also called Lam'mas Day".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.