Simple Definition of penthouse

from our Learner's Dictionary

penthouse

noun

ˈpɛntˌhaʊs

plural penthouses

: an apartment on the top floor or roof of a building

a luxurious penthouse

—often used before another noun

a penthouse suite/apartment

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“Penthouse.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/penthouse. Accessed 19 Jun. 2026.

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