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2 definitions found
 for glass gall
From The Collaborative International Dictionary of English v.0.48 :

  Gall \Gall\ (g[add]l), n. [F. galle, noix de galle, fr. L.
     galla.] (Zool.)
     An excrescence of any form produced on any part of a plant by
     insects or their larvae. They are most commonly caused by
     small Hymenoptera and Diptera which puncture the bark and lay
     their eggs in the wounds. The larvae live within the galls.
     Some galls are due to aphids, mites, etc. See Gallnut.
     [1913 Webster]
  
     Note: The galls, or gallnuts, of commerce are produced by
           insects of the genus Cynips, chiefly on an oak
           ({Quercus infectoria syn. Quercus Lusitanica) of
           Western Asia and Southern Europe. They contain much
           tannin, and are used in the manufacture of that article
           and for making ink and a black dye, as well as in
           medicine.
           [1913 Webster]
  
     Gall insect (Zool.), any insect that produces galls.
  
     Gall midge (Zool.), any small dipterous insect that
        produces galls.
  
     Gall+oak,+the+oak+({Quercus+infectoria">Gall oak, the oak ({Quercus infectoria) which yields the
        galls of commerce.
  
     Gall of glass, the neutral salt skimmed off from the
        surface of melted crown glass;- called also glass gall
        and sandiver. --Ure.
  
     Gall wasp. (Zool.) See Gallfly.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Sandiver \San"di*ver\, n. [Perh. fr. OF. sa["i]n grease, fat +
     de of + verre glass (cf. Saim), or fr. F. sel de verre
     sandiver.]
     A whitish substance which is cast up, as a scum, from the
     materials of glass in fusion, and, floating on the top, is
     skimmed off; -- called also glass gall. [Formerly written
     also sandever.]
     [1913 Webster]

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