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prostoon

[proh-stoh-on]
noun, plural pro·sto·a [proh-stoh-uh] /proʊˈstoʊ ə/.
  1. (in classical architecture) a portico.
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Origin of prostoon

< Greek próstoon; see pro-2, stoa
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018