† ˈunder-ˌdouble Obs.
[under-1 6 b: cf. subdouble s.v. sub- 10.]
= subduple. Also † under-doubled ppl. a. Obs.
| c 1430 Art of Nombryng (E.E.T.S.) 16 It shewithe that a nombre componede was the quadrat, and his rote a digit last founde with vnder-double other vndirdoubles. Ibid., Neþer to sette the doublede forwarde nether the vnder doublede. |