The Collaborative International Dictionary
Supernacular
Supernacular \Su`per*nac"u*lar\, a.
Like supernaculum; first-rate; as, a supernacular wine. [R.]
--Thackeray.
Wiktionary
supernacular
a. (context obsolete humorous of alcoholic drink English) Of outstanding quality; that one would wish to drink to the last drop.