One of the mysteries of the English language finally explained.
Coal Mining. In a direction parallel to that of the main cleavage of the coal (the cleat). Now historical and rare.
Coal Mining. Designating a passage driven in a direction parallel to that of the main cleavage of the coal (the cleat); of or relating to a headway. Formerly frequently in "headways course". Now historical.
Late 17th century (in an earlier sense). From head + -ways.
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