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1 definition found
 for Proto-
From The Collaborative International Dictionary of English v.0.48 :

  Proto- \Pro"to-\ [Gr. prw^tos first, a superl. fr. pro` before.
     See Pro-.]
     1. A combining form prefix signifying first, primary,
        primordial; as, protomartyr, the first martyr;
        protomorphic, primitive in form; protoplast, a primordial
        organism; prototype, protozoan.
        [1913 Webster]
  
     2. (Chem.)
        (a) Denoting the first or lowest of a series, or the one
            having the smallest amount of the element to the name
            of which it is prefixed; as protoxide, protochloride,
            etc.
        (b) Sometimes used as equivalent to mono-, as indicating
            that the compound has but one atom of the element to
            the name of which it is prefixed. Also used
            adjectively.
            [1913 Webster]

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