Used for purification

• Desire sex really regularly (every five years)
• Every five years
• Every five years, there's passion with return of the French right

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Lustral \Lus"tral\, a. [L. lustralis, fr. lustrum: cf. F. lustral. See Lustrum .] Of or pertaining to, or used for, purification; as, lustral days; lustral water. Of or pertaining to a lustrum.

Wikipedia Word definitions in Wikipedia
Lustral may refer to: Sertraline (also known as "Lustral"): an antidepressant Lustral (band) : an electronic music band