entresol

noun, plural en·tre·sols [en-ter-solz, ahn-truh-, en-; French ahn-truh–sawl] /ˈɛn tərˌsɒlz, ˈɑn trə-, ˈɛn-; French ɑ̃ trəˈsɔl/. Architecture.

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

noun

1. another name for mezzanine (def. 1)