Definition of tosca
1 : a calcium carbonate deposit occurring in the loess of the pampas — compare caliche
2 : a soft coral limestone deposit used for various purposes in Puerto Rico (as for masonry, road surfacing, ballast, and as fertilizer)
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Origin and Etymology of tosca
American Spanish, from Spanish, feminine of tosco rough, unpolished, uncouth, probably from Latin tuscus Tuscan; from the disreputable character of the inhabitants of the Vicus Tuscus Tuscan Street in ancient Rome
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