What is a fissure, cleft, or cavity, as in the earth or other substance. "Down to the veins of earth." Milton. Let the glass of the prisms be free from veins. Sir I. Newton called?

vein — A fissure, cleft, or cavity, as in the earth or other substance. "Down to the veins of earth." Milton. Let the glass of the prisms be free from veins. Sir I. Newton. (Webster's 1913.)

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