thumb-mouldn.(a) (see quot. 1906);(b) a small mould usually having designs in intaglio, into which the clay is pressed with the thumb in making ornaments for the decoration of ware ( Cent. Dict., Suppl. 1909).
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1906 G. F. Goodchild & C. F. TweneyTechnol. & Sci. Dict. 768/2Thumb Mould (Join.), a moulding used on the edge of tables.