plectrum [ˈplɛktrəm] (pl. plectrums 或 plectra -trə)
a thin flat piece of plastic, tortoiseshell, or other slightly flexible material held by or worn on the fingers and used to pluck the strings of a musical instrument such as a guitar 拨子,琴拨,拨弦片 ■the corresponding mechanical part which plucks the strings of an instrument such as a harpsichord 机械琴拨
语源
late Middle English: via Latin from Greek plēktron 'something with which to strike', from plēssein 'to strike'