Meaning

noun a pedal that controls the throttle valve

noun a valve that regulates the supply of fuel to the engine

noun (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

originEtymology tree Proto-Indo-European *h₂éd Proto-Italic *ad Proto-Italic *ad- Latin ad- Proto-Indo-European *kel-der. Latin celer Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Italic *-āō Latin -ō Latin celerō Latin accelerō Latin accelerātuslbor. ▲ Latin accelerō Proto-Indo-European *-tis Proto-Indo-European *-Hō…

Etymology from Wiktionary, CC BY-SA 3.0