Tetrastyle definitions Webster's 1828 Dictionary TET'RASTYLE, n. [Gr. four ... f. Gk tetrastulos (as TETRA-, STYLE) Webster's 1913 Dictionary Tetrastyle Tet"ra*style, a. [L. tetrastylon, Gr. ? with four pillars ... front; -- said of a temple, portico, or colonnade. -- n. A tetrastyle building.