dot

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dot 1 (dial.) small lump, clot XVI; minute mark XVII. OE. dott (once) head of a boil, perh. in continuous colloq. use, but not recorded again till XVI in the gen. sense of ‘small knob or lump’, when its appearance may be due to Du. dot knot, prob. rel. to OHG. tutto, tutta nipple; for the prob. base *dutt- cf. OE. dyttan (:- *duttjan), dial. dit stop up, plug.
Hence dot vb. XVIII.

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