LATIN DICTIONARYLexicon Latīnum
adverb

nū̆diū̆s

nū̆diū̆s (not comparable)
Classical[ˈnʊ.di.uːs]Ecclesiastical[ˈnuː.di.us]

Meaning

  1. not comparable(...−1) days ago; literally "it is now the ...th day since"
    nudius tertiusday before yesterday (it is now the third day)
    nudius quartusday before the day before yesterday; three days ago (not four – Latin day counting included both endpoints; if three days ago is the first day, it is now the fourth day)

nŭdĭus num (i. e. nunc) and dius = dies; the ending accommodated to that of the following numeral,
I. it is now the ... day since, always in connection with ordinal numbers; as, nudius tertius, three days ago, the day before yesterday: nudius quartus, four days ago, etc.: nudius tertius videtur compositum ex nunc et die et tertio, Paul. ex Fest. p. 170 Müll.: heri et nudius tertius, Quartus, quintus, sextus, etc., Plaut. Most. 4, 2, 40: nam ego Lemno advenio Athenas nudius tertius, id. Truc. 1, 1, 74: nudius sextus quoi talentum mutuom dedi reposcam, id. Trin. 3, 2, 101; cf. Afran. ap. Charis. p. 192 P.: nudius tertius dedi ad te epistulam longiorem, Cic. Att. 14, 11, 1; here, nudius quintus natus quidem ille est, Plaut. Truc. 2, 6, 28: recordamini, qui dies nudius tertiusdecimus fuerit, Cic. Phil. 5, 1, 2: a nudius quartā die, Vulg. Act. 10, 30.

Origins

From Proto-Indo-European *nu (“now; well; and”) + diūs, reflecting the original nom.sg. of diēs (“day”) that was later remodelled on the accusative. The former component cognate to Latin num (interrogative particle), nunc (“now”), nūper (“lately, recently”); its length is uncertain, since the original short vowel of PIE appears to have undergone lengthening in numerous daughter languages, with both Sanskrit and Greek showing both variants. The original nominative also surfaces in me-diū̆s-Fidius (“so help me God”, interjection) as well as in diurnus; whether it retained the length of the ū cannot be established. The uncertainty over etymological vowel lengths is compounded by the fact that both the scansions nŭdĭū̆s (with anceps third syllable) and nūdĭŭ(s) (with s-loss or iambic shortening) are possible in all the occurrences except one, where nū- is required.

Quick answers

What does nū̆diū̆s mean in Latin?
nū̆diū̆s, a adverb, means “(...−1) days ago; literally "it is now the ...th day since"”.
How do you pronounce nū̆diū̆s?
In classical Latin, [ˈnʊ.di.uːs]; in ecclesiastical (church) Latin, [ˈnuː.di.us].