In most languages it's plectrum. In some languages plural is plectra, not plectrums. We could start a discussion about bass player versus bassist as well. 

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When you go into guitar/bass stores do you walk up to the counterperson and say " Where would I find your plectrums?"
'hey, man! watch the plectrum!'"Pick...or plectrum...if you're not into the whole brevity thing..."