speedster

noun

speed·​ster ˈspēdztə(r) 

-dst-

plural -s

1

: one that goes or moves at high speed : a person, animal, or vehicle that excels in speed

2

: speeder sense d

Word History

Etymology

speed + -ster

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Kids Definition

speedster

noun

speed·​ster

ˈspēd-stər

: one that goes or can go very fast