ENTRESOL
mezzanine, mezzanine floor, entresol
(noun) intermediate floor just above the ground floor
Source: WordNet® 3.1
Etymology
Noun
entresol (plural entresols)
A mezzanine; an intermediate floor in a building, typically resembling a balcony. Most often used to refer to the floor immediately above the ground floor and below a higher floor.
Source: Wiktionary
En`tre*sol", n. Etym: [F.] (Arch.)
Definition: A low story between two higher ones, usually between the ground
floor and the first story; mezzanine. Parker.
Source: Webster’s Unabridged Dictionary 1913 Edition