Definition of paxwax in English:
paxwax
(also paswak)
noun
English Regional
The thick elastic ligament supporting the back of the skull, especially in a domestic quadruped; the nuchal ligament.
Origin
Middle English; earliest use found in Glossary of W. de Bibbesworth. From fax + wax.
Pronunciation
paxwax
/ˈpakswaks/