plectrum

noun

(music) A small piece of plastic, metal, ivory, etc., for plucking the strings of a guitar, lyre, mandolin, etc.

I always carry a plectrum in my guitar case.

意味（1）

(music) A small piece of plastic, metal, ivory, etc., for plucking the strings of a guitar, lyre, mandolin, etc.

意味（2）

(anatomy, zoology) A projection of bone or other stiff tissue, such as the ridges in some insects' stridulatory organs.