单词 | quebracho |
释义 | quebracho [kā`bra·chō] BOTANY Any of a number of South American trees in different genera in the order Sapindales, but all being a valuable source of wood, bark, and tannin. MATERIALS A drilling-fluid additive used for thinning or dispersing in order to control viscosity and thixotropy; made from an extract of the quebracho tree and consisting essentially of tannic acid. |
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