The story
From chrono- (“referring to time”) + -tropic (“affecting, changing”), from Ancient Greek χρόνος (khrónos, “time”) + τρόπος (trópos, “turn, direction, way”) + -ικός (-ikós, “-ic”, adjectival suffix).
Etymology from Wiktionary, CC BY-SA 4.0.
chronotropic
Today it means: Of, relating to, or affecting the rate of muscular contraction, especially of the heart. Full definition →