The Collaborative International Dictionary
Decastyle
Decastyle \Dec"a*style\, a. [Gr. ?; de`ka ten + sty`los a column.] (Arch.) Having ten columns in front; -- said of a portico, temple, etc. -- n. A portico having ten pillars or columns in front.
Wiktionary
decastyle
n. A portico with ten columns.