(n.) An inert gaseous element of the argon group, occurring in air to the extent of about one volume in a million. It was discovered by Ramsay and Travers in 1898. Liquefying point, -- 152ยก C.; symbol, Kr; atomic weight, 83.0.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). krypton. Retrieved February 22, 2019, from http://smartdefine.org/krypton/definitions/2025897 |
| Chicago | Webster's. 2011. "krypton" http://smartdefine.org/krypton/definitions/2025897 (accessed February 22, 2019). |
| Harvard | Webster's 2011, krypton, Smart Define, viewed 22 February, 2019, <http://smartdefine.org/krypton/definitions/2025897>. |
| MLA | Webster's. "krypton" 27 May 2011. Web. 22 February 2019. <http://smartdefine.org/krypton/definitions/2025897> |