Why was "tantrum" trending last week?


[yoo-nil-kwod-ee-uh m] /ˌyu nɪlˈkwɒd i əm/
noun, Chemistry, Physics.
former name of rutherfordium. Symbol: Unq.
Also called element 104.
1975-80; < Latin ūn(us) one + nīl nothing + quad(ri)- + New Latin -ium -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Encyclopedia Article for unnilquadium


an artificially produced radioactive transuranium element in Group IVb of the periodic table, atomic number 104. Soviet scientists at the Joint Institute for Nuclear Research at Dubna, Russia, U.S.S.R., announced in 1964 the discovery of element 104, which they named kurchatovium, symbol Ku (for Igor Kurchatov, a Soviet nuclear physicist). In 1969, a group of American researchers at the Lawrence Radiation Laboratory of the University of California at Berkeley announced that they had identified isotopes of the element, different from the one identified by the Soviets; the Americans then proposed the name rutherfordium, in honour of the British physicist Ernest Rutherford

Learn more about Rf with a free trial on
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Difficulty index for unnilquadium

Few English speakers likely know this word

Word Value for unnilquadium

Scrabble Words With Friends

Nearby words for unnilquadium