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KEELS. This word is applied, in England, to vessels employed in the carriage of coals. Jacob, L. D.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
It is as if an invisible hand had been stealthily uplifted from the bottom to catch hold of her keel as it glides through the water.
Gahan felt the impact of a body against the keel, followed by the soft thuds of the great bodies as they struck the ground beneath.
As before, the Pequod steeply leaned over towards the sperm whale's head, now, by the counterpoise of both heads, she regained her even keel; though sorely strained, you may well believe.
"The Captain must be very sure of his route, for I see there pieces of coral that would do for its keel if it only touched them slightly."
However, the vessel had not suffered, for her keel was solidly joined.
Robert was out there under the shed, reclining in the shade against the sloping keel of the overturned boat.
By 1700 there were 1,600 keelmen working on the Tyne in 400 keels - shallow-draught boats carrying up to 21 tons of coal at a time to waiting collier ships.
About 150 to 200 kilometres, 93 to 124 miles, beneath the surface, geologic formations called 'mantle keels' act as stabilisers for the continental crust.
Keels recently released her ninth book, Love Unfeigned, and her first poetry album, Hope.
( "Mantle flow deflected by interactions between subducted slabs and cratonic keels." Nature Geoscience published online 19 August 2012.
RE-R125.3A cutters in the production of the keels for the Swedish boats in the Victory Challenge Team.
The deepest iceberg keels ever measured reached 330 m below waterline, although researchers have hypothesized that some Antarctic icebergs today have keels 400 m deep.