What is a small ball of clay, baked hard and oiled, used as a marble by boys in playing. [Prov. Eng. & U. S.] Halliwell. Bartlett called?

knicker — A small ball of clay, baked hard and oiled, used as a marble by boys in playing. [Prov. Eng. & U. S.] Halliwell. Bartlett. (Webster's 1913.)

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