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Reserved word

A reserved word is a word which, in some computer language, cannot be used as an identifier because it is already used for some grammatical purpose. For instance, in SQL, a user cannot be called 'group' because the word 'group' is used to indicate that an identifier refers to a group, not a user.

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Urethra

... to urethritis is so called urethral syndrome[?] Passage of kidney stones through the urethra can be painful and subsequently it can lead to urethral ...