I have a hard time remembering which words are attested with a -ium gentivie plural, which words can take an accusative in -im etc, so I was looking for an online tool to help me.

The Olivetti dictionary does not seem to be very reliable based on this example: https://www.online-latin-dictionary.com/latin-dictionary-flexion.php?parola=vis

Is Wiktionary the best I can find?

  • I use the Scriba Latin Dictionary. It's an app.
    – user11898
    Feb 13, 2023 at 12:58
  • The imparisyllabic nouns make the genitive plural with "ium"(Dens, dentis/ Dentes, dentium) And the parisyllac nouns make the genitive plural with "um"(Canis, canis/Canes, canum)
    – user11898
    Feb 13, 2023 at 13:22
  • @ManuelCauãRebouças What about turris, turrium, nāvis, nāvium, etc?
    – Draconis
    Feb 13, 2023 at 16:30
  • Something called Exception?
    – user11898
    Feb 13, 2023 at 17:14
  • 5
    I don't think those are exception. See Allan and Greenough, especially 78 for more rules.
    – cmw
    Feb 13, 2023 at 17:44

1 Answer 1


Wiktionary is OK, although certainly not perfect (it makes use of templates to generate noun/adjective forms based on rules, so it's possible for them to be incorrect).

The accusative in -im is not that common. Allen and Greenough §75 gives a list (note: I think the claim there that -im would be expected to be the "regular case-ending" for i-stems is a bit uncertain), although it ends with "rarely in many other words".

Genitive plural -ium vs. -um is a real mess and I don't know of a really good way to look it up quickly. I think more than a handful of words might even not be attested at all in this form.

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