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envelope

From Wiktionary
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The Simple English Wikipedia has an article on:

Pronunciation

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Noun

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Singular
envelope

Plural
envelopes

An envelope
  1. An envelope is a paper cover that you put a letter in to send it.
    She put the letter into the envelope, addressed it to Charles, and put a stamp on it.
  2. An envelope is a covering that goes all the way around something.
    Each virus has a special envelope of protein surrounding it.
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