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1 definition found
 for Rust joint
From The Collaborative International Dictionary of English v.0.48 :

  Rust \Rust\, n. [AS. rust; akin to D. roest, G. & Sw. rost,
     Icel. ry[eth]; -- named from its color, and akin to E. red.
     [root]113. See Red.]
     1. (Chem.) The reddish yellow coating formed on iron when
        exposed to moist air, consisting of ferric oxide or
        hydroxide; hence, by extension, any metallic film of
        corrosion.
        [1913 Webster]
  
     2. (Bot.) A minute mold or fungus forming reddish or rusty
        spots on the leaves and stems of cereal and other grasses
        ({Trichobasis Rubigo-vera), now usually believed to be a
        form or condition of the corn mildew ({Puccinia
        graminis). As rust, it has solitary reddish spores; as
        corn mildew, the spores are double and blackish.
        [1913 Webster]
  
     Note: Rust is also applied to many other minute fungi which
           infest vegetation, such as the species of Ustilago,
           Uredo, and Lecythea.
           [1913 Webster]
  
     3. That which resembles rust in appearance or effects.
        Specifically: (a) A composition used in making a rust
        joint. See Rust joint, below.
        (b) Foul matter arising from degeneration; as, rust on
            salted meat.
        (c) Corrosive or injurious accretion or influence.
            [1913 Webster]
  
                  Sacred truths cleared from all rust and dross of
                  human mixtures.                   --Eikon
                                                    Basilike.
            [1913 Webster]
  
     Note: Rust is used in the formation of compounds of obvious
           meaning; as, rust-colored, rust-consumed, rust-eaten,
           and the like.
           [1913 Webster]
  
     Rust joint, a joint made between surfaces of iron by
        filling the space between them with a wet mixture of
        cast-iron borings, sal ammoniac, and sulphur, which by
        oxidation becomes hard, and impervious to steam, water,
        etc.
  
     Rust+mite+(Zool.),+a+minute+mite+({Phytopius+oleivorus">Rust mite (Zool.), a minute mite ({Phytopius oleivorus)
        which, by puncturing the rind, causes the rust-colored
        patches on oranges.
        [1913 Webster]

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