CROCK
Source: 566, 567
crock. Crock, n. an earthen pot, pan, black of a pot
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Crock (krŏk), n. [[Cf. W. croeg cover, Scot. crochit covered.]] The loose black particles collected from combustion, as on pots and kettles, or in a chimney; soot; smut; also, coloring matter which rubs off from cloth.