/en"teuhr sol', ahn"treuh-, en"-/ ; Fr. /ahonn trddeuh sawl"/ , n. , pl. entresols /-solz'/ ; Fr. /-sawl"/ . Archit.
a low floor between two higher floors, the lower one usually being a ground floor; mezzanine.
[ 1765-75; entre- INTER- + sol floor solum ground ]