undern

CIDE DICTIONARY

undern, n. [AS. undern; akin to OS. undorn, OHG. untarn, untorn, Icel. undorn mid afternoon, mid forenoon, Goth. undaúrnimats the midday meal. Cf. Undermeal, Undertime.].

 The time between; the time between sunrise and noon; specifically, the third hour of the day, or nine o'clock in the morning, according to ancient reckoning; hence, mealtime, because formerly the principal meal was eaten at that hour; also, later, the afternoon; the time between dinner and supper.  [1913 Webster]
"Betwixt undern and noon was the field all won."  [1913 Webster]
"In a bed of worts still he lay
Till it was past undern of the day."  [1913 Webster]