|Prime Vertical. Great circle of celestial sphere, and secondary to horizon, passing through east and west points of horizon.
Priming 262 Procyon
Priming. Of tide, is a decrease in time interval between successive high waters. Roughly speaking, it occurs as tides decrease from spring to neap. 2. Of a boiler, is the projection of minute particles of water into the steam; generally due to impurities in feed water, or to violent motion of ship. 3. Of a pump, is the insertion of water to expel air. 4. In painting, is the first coat applied to a bare surface.
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