Ignotum per ignotius
Defined in 2 dictionaries — Ballentine's (1916), Stimson (1881)
Ballentine's Law Dictionary
James A. Ballentine · 1916
Unknown by what is more unknown.
Glossary of Technical Terms, Phrases, and Maxims of the Common Law
Frederic Jesup Stimson · 1881
I. A thing unknown by something yet more unknown. ll,/r. It, he. II oovient: it is proper. H est communement dit: it is commonly said. niugne, illongues, etc.,/r. There.