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1. www.oed.com › dictionary › penfriend_npenfriend, n. meanings, etymology and more | Oxford English ...

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   The earliest known use of the noun penfriend is in the 1920s. OED's earliest evidence for penfriend is from 1923, in National Hort. Magazine. penfriend is formed within English, by compounding. Etymons: pen n.3, friend n. See etymology.

2. dictionary.cambridge.org › english › penfriendPENFRIEND | English meaning - Cambridge Dictionary

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   PENFRIEND definition: 1. someone who you write friendly letters to regularly, but you have never met 2. someone who you…. Learn more.

3. www.oxfordlearnersdictionaries.com › us › definitionpenfriend noun - Definition, pictures, pronunciation and ...

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   Definition of penfriend noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

4. sciencenotes.org › cell-nucleus-definitionCell Nucleus – Definition, Structure, Function

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   Oct 8, 2024 · Cell Nucleus Definition The nucleus is a large, membrane-bound organelle in eukaryotic cells that contains the cell’s genetic material in the form of DNA. Its primary role is to regulate gene expression, mediate replication, and coordinate cell activities like growth and metabolism.

5. www.oxfordreference.com › abstract › 10Dictionary of Biology - Oxford Reference

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   Nov 3, 2024 · The dictionary’s chronologies chart developments in major fields including cell biology, genetics, microscopy, and vitamins. A new feature is the inclusion of entry-level web links.With over 5,500 clear and concise entries, over 400 of them new to this edition, this market-leading dictionary is the perfect guide for anyone studying biology ...

6. dictionary.cambridge.org › penfriendpenfriend | definition in the Cambridge Learner’s Dictionary

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   penfriend meaning: someone that you write to regularly but have never met. Learn more.

7. www.wordreference.com › definition › penfriendpenfriend - WordReference.com Dictionary of English

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   penfriend - WordReference English dictionary, questions, discussion and forums. All Free.