LATIN DICTIONARYLexicon Latīnum
adjectivethird-declension two-termination adjective, plural only

novēnsidēs

novēnsidēs (genitive novēnsidum or novēnsidium)
Classical[nɔˈwẽː.sɪ.deːs]Ecclesiastical[noˈvɛn.si.des]

Meaning

  1. pluralplural onlytwo terminationof a certain group of deities called dī novensidēs or dī novensilēs whose identity is unknown

Nŏvensĭdes or Nŏvensĭles, dii, ĭum, m. novus-insideo,
I. the new gods (those received from abroad, in opp. to indigetes, the native gods): Feronia, Minerva, Novensides a Sabinis, Varr. L. L. 5, § 74 Müll. N. cr.; cf., respecting the form with d, Mar. Victorin. p. 2470 P.: Cincius numina peregrina novitate ex ipsā appellata pronuntiat, Arn. 3, 38 Orell.; cf. id. 3, 39 fin.: Jane, Juppiter, Mars pater, Quirine, Bellona, Lares, Divi Novensiles, Dii Indigetes, etc., a form of prayer in Liv. 8, 9, 6; cf. Mart. Cap. 1, § 46.

Origins

From either novus "new" and īnsideō "I sit in" or from novem "nine" and sedeō "I sit". The variant novēnsilēs shows a d-l alternation otherwise known from e.g. solium and lacrima.

Quick answers

What does novēnsidēs mean in Latin?
novēnsidēs, a adjective, means “of a certain group of deities called dī novensidēs or dī novensilēs whose identity is unknown”.
How do you pronounce novēnsidēs?
In classical Latin, [nɔˈwẽː.sɪ.deːs]; in ecclesiastical (church) Latin, [noˈvɛn.si.des].