triacontad

From Ancient Greek τριᾱκοντάς (triākontás), from τριάκοντα (triákonta, “thirty”).

• (General American) IPA^(key): /traɪəˈkɑntæd/, /triːəˈkɑntæd/
• (Received Pronunciation) IPA^(key): /trʌɪəˈkɒntad/

triacontad (plural triacontads)

1. Synonym of thirty, the number between 29 and 31.
2. A set of 30 items.
   • 1621, Richard Montagu, Diatribae upon the First Part of the Late History of Tithes, page 258:

     Against these it is, and against their other fellow Gnosticks, that Chrysostome inueigheth, Hom. 24 in Gen. as Pererius hath well obserued: who transformed God the Father, Sonne, and Holy Ghost into Numbers; that brought in their Ogdoades, Duodecads, Triacontads, Pleromaos, Bythos, Siges, and all the Aeones, blasphemous speculations, into Censum Deitatis.

• (set of 30 things): trental

• “triacontad, n.”, in OED Online ⁠, Oxford, Oxfordshire: Oxford University Press, launched 2000.