Someone or something that is very fast, especially a person who runs or drives at high speeds.
From 'speed' (Old English 'sped,' meaning success or quickness) and the agentive suffix '-ster' (one who performs an action). The '-ster' suffix creates nouns for people who do things, like 'youngster' or 'trickster'.
The suffix '-ster' is hilarious once you notice it—it originally meant 'female' in Old English (like a 'spinster' was a woman who spins), but by the 1600s it just meant 'someone who does this.' Now we use it for everyone, regardless of gender!
Complete word intelligence in one call. Free tier — 50 lookups/day.