Where does “antiantidote” come from?

antiantidote (English) comes from English antidote, from Latin antidotum, from Ancient Greek ἀντίδοτος, from Ancient Greek ἀντιδίδωμι, from Ancient Greek ᾰ̓ντῐ- — before, against; like; against.

antiantidote (English): A substance that counteracts the effect of an antidote

Definitions

A substance that counteracts the effect of an antidote

Ancestry of “antiantidote”, step by step

antiantidote traces back through two separate lines of ancestry.

via English antidote

Step	Language	Word	Meaning
1	English	antidote	A remedy to counteract the effects of poison;...
2	Latin	antidotum	a remedy against poison; an antidote
3	Ancient Greek	ἀντίδοτος	given as a remedy for
4	Ancient Greek	ἀντιδίδωμι	I give in return, repay
5	Ancient Greek	ᾰ̓ντῐ-	before, against; like; against

via English anti

Step	Language	Word	Meaning
1	English	anti	Opposed to something; That has a torsion angle...
2	English	anti-	Against, hostile to; Contrasting with the norm;...
3	Ancient Greek	ἀντι-	anti-, against; like, reminiscent of
4	Ancient Greek	ᾰ̓ντῐ́	opposite

Every word from Ancient Greek ᾰ̓ντῐ- →Every word from Ancient Greek ἀντιδίδωμι →Every word from Ancient Greek ἀντίδοτος →