Fromspeed +‎boat.

• (General American)IPA^(key):/ˈspidˌboʊt/

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speedboat (pluralspeedboats)

1. A fastboat, usually small (for 1-8 people).

   Hypernyms:powerboat <boat <vessel

   Hyponyms:go-fast boat,cigarette boat,rum-runner

2. Aboat designed and built for racing.

   Hypernyms:powerboat <boat <vessel

   Hyponyms:go-fast boat,cigarette boat,rum-runner

3. Aboat used forwaterskiing.

speedboat (third-person singular simple presentspeedboats,present participlespeedboating,simple past and past participlespeedboated)

1. (intransitive) To travel byspeedboat.