The term 'Lustral' is a 7-letter word used for PURIFICATION. It is derived from the Latin word 'lustrum', which means 'PURIFICATION'. In ancient Rome, a lustrum was a ceremony of PURIFICATION and expiation that was performed every five years. In modern times, the term 'lustral' is often used to refer to any ritual or ceremony that is intended to purify or cleanse something. It can also be used to describe any substance or object that is used to purify or cleanse something else.