MACRODON #369 -'XENON' -final version.
xenon
1) 1898, from Greek, "foreign, strange," coined by its discoverer, Scottish chemist Sir William Ramsay (1852-1916)
2) 'vacuum' -properly a loan/translation of Greek, 'xenon,' lit. "that which is empty." Meaning "a place emptied of air" is attested from 1652.