Un'dern, n.

n. [A-S. undern, O. Sax. & Icel. undorn, Goth. undauras, O. H. Ger. untarn, undorn. Cf. UNDER-TIME.] The third hour of the day, or nine o'clock in the morning, according to ancient reckoning. [Obs. or Prov. Eng.]

In a bed . . . still he lay Till it was past undern of the day. Chaucer.