Source : Webster's Revised Unabridged Dictionary (1913)

Paxwax \Pax"wax`\, n. [For faxvax, fr. AS. fea? hair (akin to
   OHG. fahs) + weaxan to grow. See {Wax} to grow, and cf.
   {Faxed}, {Pectinate}.] (Anat.)
   The strong ligament of the back of the neck in quadrupeds. It
   connects the back of the skull with dorsal spines of the
   cervical vertebr[ae], and helps to support the head. Called
   also {paxywaxy} and {packwax}.