Where does “klooster” come from?

klooster (Dutch) comes from Vulgar Latin clostrum, from Latin claustrum, from Latin claudere, from Latin claudo, from Proto-Italic klaudō — close.

klooster (Dutch): cloister, monastery

Definitions

Step	Language	Word	Meaning
1	Vulgar Latin	clostrum	nominative neuter singular of clōstra; accusative...
2	Latin	claustrum	a bar, band, bolt; gate, door, bulwark; enclosure
3	Latin	claudere	present active infinitive of claudō;...
4	Latin	claudo	I shut, close, lock; I imprison, confine; I...
5	Proto-Italic	klaudō	close