roke

noun3

1. •
   (dialect, UK) Fog, mist; light rain; smoke, vapour; damp.
2. •
   A defect in an ingot of steel: a depression lined with scale.
3. •
   (dialect, UK) A measurement of coal ore.

   • In 1450 certain lands at Codnor were exchanged subject to the condition that one of the parites should receive yearly three roke of coal if any 'myne of cole' were got. — 1907