A classical architectural building design featuring ten columns across the front, or the arrangement itself of ten supporting columns.
From the Greek prefix 'deca-' (ten) combined with 'style' (from 'stylos,' meaning pillar or column). This noun form describes the specific architectural arrangement.
The Pantheon in Rome and a handful of other surviving buildings used the decastyle design—it's so rare because ten-column fronts looked mathematically awkward to Greek eyes that preferred symmetrical odd-number designs like seven or nine columns.
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