Cryptophasia

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Cryptophasia is the phenomenon of a language developed by twins (identical or fraternal) that only the two children can understand. The word has its roots from the Greek crypto-, meaning secret, and -phasia, meaning speech.

Excerpt from the Wikipedia article “Cryptophasia”, under the CC BY-SA 4.0 license. Read the article on Wikipedia