GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Patio , n. [Sp., a court] (Metal) A paved yard or floor where ores are cleaned and sorted, or where ore, salt, mercury, etc., are trampled by horses, to effect intermixture and amalgamation.
   1913 Webster
   ☞ The patio process is used to reduce silver ores by amalgamation.
   1913 Webster
   In Spain, Spanish America, etc., a court or courtyard of a house or other building; esp., an inner court open to the sky.
   Webster 1913 Suppl.
    A usually paved area adjacent to a dwelling, used for outdoor lounging, dining, receptions of guests, etc.
   PJC