"Nucular" is a commonly used metathetic form of the word "nuclear". While it is a mispronunciation, and no dictionaries list this particular pronunciation as correct, several make mention of it because of its increased usage.
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Notable users
U.S. presidents who have used this pronunciation include Dwight D. Eisenhower, Jimmy Carter, Bill Clinton, George W. Bush as well as U.S. Vice President Walter Mondale. In his 2005 book, Going Nucular, linguist Geoffrey Nunberg suggests that the reasons underlying the differing pronunciations of this word may be different from president to president. Whereas Eisenhower's pronunciation most likely arose from his lack of familiarity with the word (having first learned it in mid-life), Bush's usage may represent a calculated effort to appeal to populist sentiment, though this theory is rejected by linguist Steven Pinker. This analysis is repeated in the second edition of Charles Harrington Elster's The Big Book Of Beastly Mispronunciations.
Oxford Professor Marcus du Sautoy was heard to use it in a BBC documentary. The actor and narrator Orson Welles said "nucular" while speaking at the 1982 "No Nukes" rally in New York City's Central Park.
Edward Teller, "father" of the American hydrogen bomb, supposedly used this particular pronunciation, and this usage is a limited tradition within the American nuclear research establishment. However, a clip from a 1965 interview with Teller on the ill-fated Project Plowshare seems to contradict this claim.
Uses in fiction
In Woody Allen's 1989 film Crimes and Misdemeanors, Mia Farrow's character says she could never fall for any man who says "nucular." The pronunciation was satirized in the 1996 science fiction film Mars Attacks!. Later, the pronunciation was utilized earnestly by the titular character in Indiana Jones and the Kingdom of the Crystal Skull after Indiana survives an atomic bomb test by crawling inside a lead-lined refrigerator. This pronunciation was also used in the 2012 animated family film Madagascar 3: Europe's Most Wanted.
In Don Delillo's 1997 novel Underworld, Marvin mentions nuclear weapons and it is said "He pronounced it nucular".
Homer Simpson (a nuclear power plant employee) of the popular American animated TV series The Simpsons and Peter Griffin of the animated comedy series Family Guy both pronounce nuclear this way (during the episode "Da Boom," Peter 'corrects' Lois Griffin's correct pronunciation of the word).
In the video game Starcraft II, the Ghost exclaims "Nucular launch detected" if he is clicked on repeatedly.
In the last season of popular TV show "24" (season 9 episode 11), both US President and his admirals generously use "nucular" under the threat of unraveling military crisis between US and China.
In GoldenEye, the 1995 James Bond film, Bond tells Valentin Dmitrovich Zukovsky (played by Robbie Coltrane) that General Arkady Grigorovich Ourumov (played by Gottfried John) stole a helicopter, stating that "he used the chopper to steal a 'nucular' weapon." This was at 1:02:46 in the film.
Motivation
Steven Pinker has proposed a phonotactic explanation for the conversion of nuclear to nucular: the unusual and disfavored sequence [kli.ər] is gradually transformed to a more acceptable configuration via metathesis. However, Arnold Zwicky notes that [kli.ər] presents no difficulty for English speakers in words such as pricklier. He also regards the proposition of metathesis as unnecessary. Zwicky suggests a morphological origin, combining the slang nuke with the common sequence -cular (molecular, particular, etc.). Supporting Zwicky's hypothesis, Geoffrey Nunberg quotes a government weapons specialist: "Oh, I only say 'nucular' when I'm talking about nukes." Nunberg argues that this pronunciation by weapons specialists and by politicians such as Bush – who are aware of the more accepted pronunciation – may be a "deliberate choice". He suggests that the reasons for this choice are to "assert authority" or to sound folksy.