Where does “exclūsa” come from?

exclūsa (Latin) comes from Latin exclūsus, from Latin exclūdō, from Latin claudere, from Latin claudo, from Proto-Italic klaudō — close.

Ancestry of “exclūsa”, step by step

Step	Language	Word	Meaning
1	Latin	exclūsus	excluded
2	Latin	exclūdō	to shut out; cut off, remove, separate from something
3	Latin	claudere	present active infinitive of claudō;...
4	Latin	claudo	I shut, close, lock; I imprison, confine; I...
5	Proto-Italic	klaudō	close