A tanker is a large vehicle or ship designed to transport liquids or gases in bulk, such as oil, chemicals, or fuel. It has big built-in tanks for carrying these materials safely.
It is formed from 'tank' plus the agent suffix '-er', meaning 'something that has or uses tanks'. The word became common in the 20th century with the rise of large-scale oil and fuel transport.
Some oil tankers are so huge that they can be longer than several football fields laid end to end. Because they carry such dangerous cargo, one accident can affect entire coastlines, which is why tanker design and rules are a big deal in environmental protection.
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