What is "tetrastyle"

Tetrastyle \Tet"ra*style\, a. [L. tetrastylon, Gr. ? with four pillars in front; te`tra- (see Tetra-) + ? a column.] (Arch.) Having four columns in front; -- said of a temple, portico, or colonnade. -- n. A tetrastyle building.

n. (label en architecture) A building (especially a portico) that has four columns