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Idlers idler
On a merchant ship, those crew members who do not stand a regular watch.
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Illuminating oil
Kerosene, used in lamps.
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Immunity immunity
Resistance to disease, developed naturally or through exposure.
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Impeller
A rotor or rotor blade. In pumps and turbines, it is powered and moves air or other fluids. In measuring instruments, it is moved by a fluid passing it, and rotations can be counted.
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In ballast
Empty of cargo but carrying ballast, stones or sand or something else of low value to give the ship stability.
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Indian
Refers to either a native of India, or to Native Americans. Columbus used this term for native people because he mistakenly thought he had landed on the subcontinent of India.
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Indigenous
Native to a place.
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Industrial economy
An economy that sustains itself by processing raw materials or resources into manufactured items.
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Inshore
Near shore. In fishing the area considered to be fishable in a day's trip from shore. Formal definitions have these as 6 nautical miles from land.
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Internal combustion engine
An engine whose power is developed by burning fuel inside the working cylinders or combustion chamber. Generally refers to piston-driven engines like gasoline and diesel engines, but turbines used on jet aircraft and ships are also internal combustion engines.
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Internal head
Marine toilet
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International Flag Code International code of Signals
A series of signal flags and pennants, one flag for each letter of the alphabet and one pennant for each number between 0 and 9. There are three additional pennants for substitutes and four more with special meanings agreed on by all maritime countries for communication between ships and between ship and shore.
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Intertidal zone
The land exposed between high and low tides.
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Isthmus of Panama
An isthmus is a narrow, connecting piece of land between two larger pieces. The Isthmus of Panama is the site of the Panama Canal.
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Ivory
The hard, creamy white substance that makes up the teeth and tusks of some animals.
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