IPA: /ˈboʊthaʊs/
KK: /ˈboʊthaʊs/
A structure built to store and protect boats.
We kept our canoe in the boathouse during the winter months.
Boathouse is formed from "boat" (from Old English "bāt", meaning a small vessel for traveling on water) and "house" (from Old English "hūs", meaning a shelter or dwelling). The word refers to a structure that serves as a shelter for boats.
Think of a 'shelter' ('house') for 'boats' — that's what a boathouse is.