Meaning

noun the historic period from about 1600 until 1750 when the baroque style of art, architecture, and music flourished in Europe

noun elaborate and extensive ornamentation in decorative art and architecture that flourished in Europe in the 17th century

adjective having elaborate symmetrical ornamentation; -William Dean Howells

originVia French baroque (which originally meant a pearl of irregular shape), from Portuguese barroco (“irregular pearl”); related to Spanish barrueco and Italian barocco, of uncertain ultimate origin, but possibly from Latin verrūca (“wart”). It has been suggested that the term derives from Baroco, a technical term from scholastic logic.

Etymology from Wiktionary, CC BY-SA 3.0