köken: From Middle Low German slagge (“slag”, older “splinter of hammered iron”, 14th c.), from slān (“to hit, strike”), the cognate of German schlagen. Compare Dutch slak, English slag, both also from Middle Low German.
köken: Either borrowed from Latin scoria, from Ancient Greek σκωρία (skōría), or possibly a popular continuation of a Vulgar Latin scauria, an Iberian variant of this word.
köken: From Middle Dutch slecke, slacke, from Old Dutch *slecco, from Proto-Germanic *slikkô, perhaps ultimately from Proto-Indo-European *sliǵ-ōn, from *sley- (“smooth; slick; sticky; slimy”). Cognate with Luxembourgish Schleek, German Low German Slacke, Slack (“snail”).
köken: From Low German slagge, slakke, from Middle Low German slagge, perhaps from slagen (“to strike”), from Old Saxon slegi, from Proto-West Germanic *slagi.
Etymology tree Proto-Indo-European *slak-der. Proto-Germanic *slahaną Proto-Germanic *slagiz Proto-West Germanic *slagi Old High German slag Middle High German slac German Schlagbor. Polish szlag Borrowed from German Schlag.