Where does “antitachycardia” come from?

antitachycardia (English) comes from English tachycardia, from New Latin tachycardia, from Ancient Greek Καρδία, from Proto-Hellenic kərdíyā, from Proto-Indo-European ḱr̥díyeh₂, from Proto-Indo-European ḱḗr — heart.

Ancestry of “antitachycardia”, step by step

antitachycardia traces back through two separate lines of ancestry.

via English tachycardia

StepLanguageWordMeaning
1EnglishtachycardiaA rapid resting heart rate, especially one above...
2New Latintachycardia
3Ancient GreekΚαρδίαheart (as the source of emotion, love, etc.)
4Proto-Hellenickərdíyā
5Proto-Indo-Europeanḱr̥díyeh₂
6Proto-Indo-Europeanḱḗrheart

via English anti

StepLanguageWordMeaning
1EnglishantiOpposed to something; That has a torsion angle...
2Englishanti-Against, hostile to; Contrasting with the norm;...
3Ancient Greekἀντι-anti-, against; like, reminiscent of
4Ancient Greekᾰ̓ντῐ́opposite
Every word from Proto-Indo-European ḱḗrEvery word from Proto-Indo-European ḱr̥díyeh₂Every word from Proto-Hellenic kərdíyā