Based on the prefix, de-, the word "decongestant" means:
A prefix is a kind of affix to the main word. The prefix can be used to generate the derivative of a word. Prefixes are not complete words in themselves but they can help to form words with new meanings.
An example is the word, "Congestant." This word by itself makes complete meaning. It describes something that causes congestion. However, the addition of the prefix de- gives the word a whole new meaning. This time, the word refers to a substance that is meant to remove congestion. This example perfectly explains the meaning and use of prefixes.
We also have another type of affix that is known as a suffix. This is appended after the main word. An example is "Kindness." The suffix is -ness and this refers to the state of something. Other examples are, -ment, -ship, and -full.
Learn more about prefixes here:
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