(obsolete) of or relating to the day before yesterdayEtymology: From nudius tertius, which is formed from the phrase nunc dies
tertius est, (now is the third day).
” 1647 WARD Simp. Cobler 26 When I heare a..Gentledame inquire..what is the nudiustertian fashion of the Court; I mean the very newest.
(Source: Complete Oxford English Dictionary)