Where does “நூலகம்” come from?

நூலகம் (Tamil) comes from Tamil நூல், from Old Tamil 𑀦𑀽𑀮𑁆, from Proto-Dravidian *nūl.

நூலகம் (Tamil): library

Definitions

Step	Language	Word	Meaning
1	Tamil	நூல்	book, treatise; systematic doctrine, science;...
2	Old Tamil	𑀦𑀽𑀮𑁆	—
3	Proto-Dravidian	*nūl	—

நூலகம் — Etymology, Origin & Word History | Etymology Explorer