unnilennium

[yoo-ni-len-ee-uhm]

noun

Chemistry, Physics.

1. the systematic element name for element 109 before being named meitnerium. Une

Word History and Origins

Origin of unnilennium¹

First recorded in 1980–85; from Latin ūn(us) “one” + nil ( def. ) “zero” + Greek enn(ė́a) “nine” + -ium ( def. )