a. (adv.) [See -FOLD.] Thirty times as great or as much; increased thirty times.
c. 1000. Ags. Gosp., Matt. xiii. 8. Sume … sealdon weastm sum hund-fealdne … sum þrittiʓ-fealdne.
c. 1230. Hali Meid., 23. Wedlac haueð hire frut þrittifald in heuene.
1382. Wyclif, Matt. xiii. 8. Sume an hundred fold, another sexti fold, another thritti fold.
1871. Proctor, Light Sci., 132. An increase of width not less than thirtyfold.
1898. Allbutt’s Syst. Med., V. 450. Mixing … equal volumes of, say, thirty and forty-fold diluted normal acid and titrating with the resulting thirty-five-fold acid solution.
