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noun, Nautical.
an ornamental ball forming the truck of a mast.


Read Also:

  • Mast-bed

    noun, Nautical. 1. a construction in a wooden deck around the opening for a mast.

  • Mast-band

    noun, Nautical. 1. a hoop of metal around a mast, used as a reinforcement or as an object for attaching stays, tackles, etc.

  • Mast-cell

    noun, Biology. 1. a large granular cell, common in connective tissue, that produces heparin, histamine, and serotonin. noun 1. a type of granular basophil cell in connective tissue that releases heparin, histamine, and serotonin during inflammation and allergic reactions mast cell n. A cell found in connective tissue that contains numerous basophilic granules and releases […]

  • Mast cell leukemia

    mast cell leukemia n. See basophilic leukemia.

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