dofúarat

From dí- +‎ uss- +‎ reithid. There is also an extra fo- added onto the deuterotonic forms.

• IPA^(key):

do·fúarat (prototonic ·diurat, verbal noun diurad)

1. to remain
   • c. 800–825, Diarmait, Milan Glosses on the Psalms, published in Thesaurus Palaeohibernicus (reprinted 1987, Dublin Institute for Advanced Studies), edited and with translations by Whitley Stokes and John Strachan, vol. I, pp. 7–483, Ml. 56^d2

     .i. níɔ diuair ní do [sic] foraithmiut etir.

     i.e. there will not remain anything at all of memory.

   • c. 800–825, Diarmait, Milan Glosses on the Psalms, published in Thesaurus Palaeohibernicus (reprinted 1987, Dublin Institute for Advanced Studies), edited and with translations by Whitley Stokes and John Strachan, vol. I, pp. 7–483, Ml. 97^d10

     Is peccad díabul lesom .i. fodord doïb di dommatu, ⁊ du·fúairthed ní leu fora sáith din main, ⁊ todlugud inna féulæ ɔ amairis nánda·tibérad Día doïb, ⁊ nach coimnacuir ⁊ issi dano insin ind frescissiu co fochaid.

     It is a double sin in his opinion, i.e. the murmuring by them of want, although there remained some of the manna with them upon their satiety, and demanding the meat with faithlessness that God would not give it to them, and that he could not; therefore that is the expectation with testing.

   • c. 845, St Gall Glosses on Priscian, published in Thesaurus Palaeohibernicus (reprinted 1975, Dublin Institute for Advanced Studies), edited and with translations by Whitley Stokes and John Strachan, vol. II, pp. 49–224, Sg. 18^a6

     Cindas on? Ni anse ón: uaire is i ndi guthaigthi airdíxi do·fuasilcther deogur do·rruairthetar di aimsir vocalis as·berr .i. in consonante .i. inde duplex est.

     How? Not hard is this : because the diphthong is resolved into two long vowels, there have remained in consonante i two instances of the vowel called /i/. Hence is double.

• Gregory Toner, Sharon Arbuthnot, Máire Ní Mhaonaigh, Marie-Luise Theuerkauf, Dagmar Wodtko, editors (2019), “do-fúarat”, in eDIL: Electronic Dictionary of the Irish Language
• Pedersen, Holger (1913) Vergleichende Grammatik der keltischen Sprachen [Comparative Grammar of the Celtic Languages] (in German), volume II, Göttingen: Vandenhoeck und Ruprecht, →ISBN, § 797.9, page 600