a construction in a wooden deck around the opening for a mast.
noun, Nautical. 1. a hoop of metal around a mast, used as a reinforcement or as an object for attaching stays, tackles, etc.
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.
noun, Nautical. 1. a pierced slab of hardwood built into the deck structure of a small ship or boat to receive the force of the mast, which is fitted tightly through it. 2. Also called mast hasp. a metal collar fitted to a thwart of a small boat to steady a mast.