Where does “συγχαρητήριος” come from?

συγχαρητήριος (Greek) comes from Greek συγχαίρω, from Ancient Greek συγχαίρω, from Ancient Greek χαίρω, from Proto-Hellenic kʰəřřō, from Proto-Indo-European ǵʰer- — to yearn for; to enclose; bowels, intestines.

συγχαρητήριος (Greek): congratulatory