Webster's English Dictionary

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nock

1. nock \'na:k\ n [ME nocke notched tip on the end of a bow; akin to MD 
   nocke summit,] tip, L nux nut - more at NUT 1: one of the notches cut in 
   either of two tips of horn fastened on the end s of a bow or in the bow 
   itself for holding the string 2a: the part of an arrow having a notch for 
   the bowstring  2b: the notch itself 
2. nock vt : to make a notch in or fit into or by means of a notch