Columnâtus, pen. prod. Adiectiuum. Varro. Hauing many pillers.
Lewis and Short: Latin dictionary
cŏlumnātus, a, um, adj. [id.], supported by posts or pillars (perh. only in the foll. exs.): tholus, Varr. R. R. 3, 5, 12: diversoria, Ambros. de Cain et Abel, 1, 5, 19: pons, Ampel. Lib. Mem. 8, 3.—Humorously: os, i. e.