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 for Mass copper
From The Collaborative International Dictionary of English v.0.48 :

  Mass \Mass\, n. [OE. masse, F. masse, L. massa; akin to Gr. ? a
     barley cake, fr. ? to knead. Cf. Macerate.]
     [1913 Webster]
     1. A quantity of matter cohering together so as to make one
        body, or an aggregation of particles or things which
        collectively make one body or quantity, usually of
        considerable size; as, a mass of ore, metal, sand, or
        [1913 Webster]
              If it were not for these principles, the bodies of
              the earth, planets, comets, sun, and all things in
              them, would grow cold and freeze, and become
              inactive masses.                      --Sir I.
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              A deep mass of continual sea is slower stirred
              To rage.                              --Savile.
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     2. (Phar.) A medicinal substance made into a cohesive,
        homogeneous lump, of consistency suitable for making
        pills; as, blue mass.
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     3. A large quantity; a sum.
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              All the mass of gold that comes into Spain. --Sir W.
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              He had spent a huge mass of treasure. --Sir J.
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     4. Bulk; magnitude; body; size.
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              This army of such mass and charge.    --Shak.
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     5. The principal part; the main body.
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              Night closed upon the pursuit, and aided the mass of
              the fugitives in their escape.        --Jowett
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     6. (Physics) The quantity of matter which a body contains,
        irrespective of its bulk or volume.
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     Note: Mass and weight are often used, in a general way, as
           interchangeable terms, since the weight of a body is
           proportional to its mass (under the same or equal
           gravitative forces), and the mass is usually
           ascertained from the weight. Yet the two ideas, mass
           and weight, are quite distinct. Mass is the quantity of
           matter in a body; weight is the comparative force with
           which it tends towards the center of the earth. A mass
           of sugar and a mass of lead are assumed to be equal
           when they show an equal weight by balancing each other
           in the scales.
           [1913 Webster]
     Blue mass. See under Blue.
     Mass center (Geom.), the center of gravity of a triangle.
     Mass copper, native copper in a large mass.
     Mass meeting, a large or general assembly of people,
        usually a meeting having some relation to politics.
     The masses, the great body of the people, as contrasted
        with the higher classes; the populace.
        [1913 Webster]

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