I.per diaeresin always dissyl. with long penult: “furit intus aquāï,” Verg. A. 7, 464: “aurāï simplicis ignem,” id. ib. 6, 747: “terrāï frugiferāï,” Mart. 11, 91, 5; cf. Quint. 1, 7, 18; Spauld. Prisc. 728; Prob. 1438; Vel. Long. 2222; Mart. Vict. 2460 P.—In prim. syllables, as in voc. Gaĭ, ăi could not be changed to ae if i was an ending; but i was changed to i cons., when the word received accession, e. g. Gaius.—When a conson. followed ai, as in CNAIVOS for ΓΝΑΙϝΟΣ (v. the Epitaphs of the Scipios, in the Append.), ae was written at a later per., as Gnaeus; hence from Γράϊος both Graecus and Graius; from Αἴακος, Aeacus, and Aiax, for Αἴας, were formed; just as Achaeus or Achivus with Achaĭus or Achaĭcus was used.
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X - xystus
ai , in old Lat., corresponding to ae: AIDILIS, CAISAR, AITERNOS, for Aedilis, Caesar, aeternus; also, still later, sometimes in the poets in the termination of the genitive of the first decl.; but, as in Enn. and Lucr.,