proprietary name for a surfacing compound, 1927, probably based on German spachtel "putty knife, mastic, filler." The verb is attested from 1940. Related: Spackled; spackling.
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Definitions of Spackle from WordNet
spackle (n.)
powder (containing gypsum plaster and glue) that when mixed with water forms a plastic paste used to fill cracks and holes in plaster;