entresol

US: (en′tər sol′, än′trə-, en′-; Fr. än trə sôl′)

WordReference Random House Unabridged Dictionary of American English © 2025

en•tre•sol  (en′tər sol′, än′trə-, en′-; Fr. än trə sôl′), n., pl. -sols (-solz′; Fr. -sôl′). [Archit.]

1. Architecture a low floor between two higher floors, the lower one usually being a ground floor;
   mezzanine.

• Latin solum ground
• French: literally, between-floor, equivalent. to entre- inter- + sol floor
• 1765–75

Collins Concise English Dictionary © HarperCollins Publishers::

entresol / ˌɒntrəˈsɒl ɑ̃trəsɔl/ noun

1. another name for mezzanine1

Etymology: 18th Century: from French, literally: between floors, from entre- inter- + sol floor, ground, from Latin solum