The term 'member of a noble family' can be summarized by the word 'XENON', which is a five-letter word. XENON is a chemical element with the symbol Xe and atomic number 54. It is a colorless, odorless, tasteless noble gas found in the Earth's atmosphere in trace amounts. XENON is used in some types of lighting and in photographic flash lamps. It is also used in medical imaging and radiation therapy. In the context of a noble family, XENON could refer to a person who is a member of a royal or aristocratic family.