Where does “brachycardia” come from?

brachycardia (English) comes from English cardia, from Latin Cardia, from Ancient Greek Καρδία, from Proto-Hellenic kərdíyā, from Proto-Indo-European ḱr̥díyeh₂, from Proto-Indo-European ḱḗr — heart.

Ancestry of “brachycardia”, step by step

StepLanguageWordMeaning
1EnglishcardiaThe area of the stomach which directly receives...
2LatinCardia—
3Ancient GreekΚαρδίαheart (as the source of emotion, love, etc.)
4Proto-Hellenickərdíyā—
5Proto-Indo-Europeanḱr̥díyeh₂—
6Proto-Indo-Europeanḱḗrheart
Every word from Proto-Indo-European ḱḗr →Every word from Proto-Indo-European ḱr̥díyeh₂ →Every word from Proto-Hellenic kərdíyā →