Mining. Also weigh-. [app. f. WAY sb.1 + BOARD sb. (cf. sense 16).] (See quot. 1859.)

1

  α.  1747.  Hooson, Miner’s Dict., L 3. These Leaps never happen but at some Way-board, or large Bed-joynt.

2

1818.  W. Phillips, Geol., 137. The limestone strata contain thin beds of clay, termed by the miner way-boards.

3

1859.  Page, Handbk. Geol. Terms, Wayboards, a mining term, now pretty generally employed by geologists to designate any thin layers or bands that separate or define the boundaries of thicker strata.

4

  β.  1802.  J. Mawe, Mineral. Derbysh., Gloss. (E.D.S.), Weighboard, clay intersecting the vein.

5

1860.  Worcester.

6

1864.  Webster. (And in later Dicts.)

7