Antiscorbutics. Medicinal substances that prevent or allay scurvy. Statutory antiscorbutics are lime, lemon and orange juices.
Anti-Solar Tide. Tidal undulation generated on side of Earth opposite to that on which tractive force of Sun is exerted.
Anti-Trades. High level winds that flow above and opposite to the trade winds. They are not surface winds, and so do not affect seamen directly: they do concern meteorologists.
Anvil Cloud. Cumulonimbus cloud with wedge-shaped projection of its upper edge. Fairly common in thunderstorms.
Apeak. Said of anchor when cable is taut and vertical. Said of yards when they are cockbilled in contrary directions.
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