guideword
Noun

guideword (plural guidewords)

  1. A watchword; a word or phrase that serves as one's guide.
  2. (publishing) A word that is printed at the top or bottom of the page in a reference work, in order to help readers find a specific entry.
  3. (chiefly, business) Any of the words in a memo or email that define metadata regarding the message, such as sender, recipient, and subject.



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