Latin

Alternative forms

• inratus
• inritus

Adjective

irritus m ‎(feminine irrita, neuter irritum); first/second declension

1. invalid, void
2. ineffective, useless, irrelevant

Inflection

First/second declension.

Etymology 2

Possibly from Proto-Italic *rito ‎(“stirred up”), from Proto-Indo-European *h₃er- ‎(“to move, stir”).

Alternative forms

• hirrītus

Pronunciation

• (Classical) IPA^(key): /irˈriː.tus/, [ɪrˈriː.tʊs]

Noun

irrītus m ‎(genitive irrītūs); fourth declension

1. (of dogs) snarling

Inflection

Fourth declension.

References

• irritus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• Félix Gaffiot (1934), “irritus”, in Dictionnaire Illustré Latin-Français, Paris: Hachette.
• Meissner, Carl; Auden, Henry William (1894) Latin Phrase-Book, London: Macmillan and Co.
  • to frustrate, nullify: ad irritum redigere aliquid
    
  • expectation is overthrown: spes ad irritum cadit, ad irritum redigitur
    
  • to annul, revoke a will: testamentum irritum facere, rumpere
    
  • a law is valid: lex rata est (opp. irrita)
    
• Pokorny, Julius (1959) Indogermanisches etymologisches Wörterbuch [Indo-European Etymological Dictionary] (in German), volume I, Bern, München: Francke Verlag, page 326