Where does “பறவையியல்” come from?

பறவையியல் (Tamil) comes from Tamil -இயல், from Tamil இயல் — to be able to, be possible.

Ancestry of “பறவையியல்”, step by step

Step	Language	Word	Meaning
1	Tamil	-இயல்	logy, -ology, -ics, -istics, -nomy, -onomy, -omics, -graphy, study of, science of
2	Tamil	இயல்	to be able to, be possible