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The Collaborative International Dictionary
buttonmould

Buttonmold \But"ton*mold`\, n. A disk of bone, wood, or other material, which is made into a button by covering it with cloth. [Written also buttonmould.]

Fossil buttonmolds, joints of encrinites. See Encrinite.

Wiktionary
buttonmould

n. (context archaic English) A disc of bone, wood, or other material, made into a button by covering it with cloth.