seacoal noun4 •Coal from the sea: mineral coal that washes up from the sea onto beaches.John Thompson of Setauket has a permit to go to Flushing and other parts of Long Island to search for sea-coal, of which he hath probable information. — 1677 •(historical) Coal from across the sea: mineral coal, as opposed to charcoal, in a time and place in which the former arrived by ship and the latter arrived overland (such as London in Elizabethan times).[…] and then of Sea-Coal and other necessary Fewel, fit for the working or melting of these Metalls; […] — 1662 •(US) Such coal used in foundry practice, intermixed with foundry sand or applied in a layer on its face, to modify the behavior of the molten metal. •(US, historical) Coal to be used at sea: a certain class of mineral coal, especially suitable for the steam engines of ships at sea and locomotives.
