plectrum /plekˈtrəm/

1. A pointed device held in the fingers or on the thumb, with which the strings of eg a guitar are struck
2. The quill or other device for plucking the strings of the ancient Greek lyre or other musical instrument

—Also plecˈtre /-tər/ or plecˈtron (pl plecˈtrons or plecˈtra)

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