Where does “lustrandus” come from?

lustrandus (Latin) comes from Latin lūstrō, from Latin lūstrum, from Old Latin loustrom, from Proto-Indo-European lewkstrom, from Proto-Indo-European lewk- — bright; to shine; to see.

Definitions

Ancestry of “lustrandus”, step by step

Step	Language	Word	Meaning
1	Latin	lūstrō	to purify by means of a propitiatory sacrifice
2	Latin	lūstrum	bog, morass, place where boars and swine wallow
3	Old Latin	loustrom	—
4	Proto-Indo-European	lewkstrom	—
5	Proto-Indo-European	lewk-	bright; to shine; to see

Every word from Proto-Indo-European lewk- →Every word from Proto-Indo-European lewkstrom →Every word from Old Latin loustrom →