Lam|mas «LAM uhs», noun, or Lammas Day,
1. August 1, the day of a harvest festival formerly held in England.
2. August 1, a religious feast in the Roman Catholic Church commemorating the imprisonment and miraculous escape of Saint Peter (in the Bible, Acts 12:4-10).
╂[Old English hlāfmæsse < hlāf bread + mæsse mass (the consecration of loaves of the year's first grain)]
Useful english dictionary. 2012.