GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Smalt , n. [It. smalto, LL. smaltum; of Teutonic origin; cf. OHG. smalz grease, butter, G. schmalz grease, OHG. smelzan to melt, G. schmelzen. See Smelt, v. t., and cf. Amel, Enamel.] A deep blue pigment or coloring material used in various arts. It is a vitreous substance made of cobalt, potash, and calcined quartz fused, and reduced to a powder.
   1913 Webster