pulse

The heartbeat sense traces back to Latin pulsus, "beat, stroke," from the verb pellō, "to drive or strike" — the same root that gives us push, via the frequentative pulsāre. A completely separate word, Latin puls, meaning porridge (probably from Greek póltos, "porridge made from flour"), gives us the culinary sense of pulse meaning lentils and beans.

The bodily sense entered English through Anglo-Norman and Old French as pous or pouse, naming both the throb of an artery and the spot on the body where you feel it, before settling into its modern spelling. The food sense followed a separate path from Latin puls through French pous into Middle English puls, referring to the seeds of leguminous plants.

Pulse is a doublet of push — both descend from Latin pellō, "to drive or strike," just through different Latin derivations (pulsus versus pulsāre).