lustra
Multiple Entries:lustra lustrum
Concise Oxford English Dictionary © 2008 Oxford University Press:
lustra/ˈlʌstrə(r)/
plural form of lustrum.
Concise Oxford English Dictionary © 2008 Oxford University Press:
lustrum /ˈlʌstrəm/
▶noun (pl. lustra /-trə/ or lustrums) chiefly historical a period of five years.
– origin C16: from L., orig. denoting a purificatory sacrifice after a five-yearly census.
'lustra' also found in these Oxford entries:

