Source : Webster's Revised Unabridged Dictionary (1913)

Nucha \Nu"cha\, n.; pl. {Nuch?}. [LL.] (Zo["o]l.)
   The back or upper part of the neck; the nape.

Source : WordNet®

nucha
     n : the back side of the neck [syn: {nape}, {scruff}]
     [also: {nuchae} (pl)]