Meanings
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Thesaurus
Simplified etymology
Penthouse began as Middle English pentis, meaning a shed, outhouse, or lean-to attached to a building. Pentis was shortened from French apentis, ultimately from Latin pendere “to hang.” During the 16th century, its origin was obscured by association with French pente “slope” and English house; the modern sense of a top-floor apartment arose in the United States in the 1890s.
Etymology
A folk-etymological reshaping of Middle English pentice, from Anglo-Norman pentiz and ultimately Latin appendere ("to hang or append"). Because the projecting shelter looked attached to a house, speakers recast the unfamiliar ending as house. The luxury top-floor apartment sense arose in the twentieth century.