Where does “antirretroviral” come from?

antirretroviral (Spanish) comes from Spanish anti-, from Ancient Greek ἀντι-, from Ancient Greek ᾰ̓ντῐ́ — opposite.

antirretroviral (Spanish): antiretroviral

Definitions

Step	Language	Word	Meaning
1	Spanish	anti-	anti-; against, opposite, protecting against
2	Ancient Greek	ἀντι-	anti-, against; like, reminiscent of
3	Ancient Greek	ᾰ̓ντῐ́	opposite

antirretroviral — Etymology, Origin & Word History | Etymology Explorer