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superheavy

American

[soo-per-hev-ee] / ˌsu pərˈhɛv i /

adjective

superheavier, superheaviest

Chemistry, Physics. pertaining to any of a series of elements having an atomic number greater than 103.
heavier than usual for its kind.

a superheavy oil; superheavy magnetic monopoles.

superheavy British

/ ˌsuːpəˈhɛvɪ /

adjective

physics denoting or relating to elements of high atomic number (above 109) postulated to exist with special stability as a consequence of the shell model of the nucleus

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of superheavy

First recorded in 1820–30; super- ( def. ) + heavy ( def. )

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This superheavy element would be something entirely new to our planet.

From BBC • Feb. 22, 2025

This leads to a revision of the superheavy landscape in two important ways.

From Science Daily • Feb. 13, 2024

However, there is a general agreement that truly stable superheavy nuclei are no longer to be expected.

From Science Daily • Feb. 13, 2024

China, meanwhile, is working on its own superheavy rocket called the Long March 9 to transport humans and machinery to the moon and Mars as early as the 2030s.

From Scientific American • Apr. 12, 2022

Teller believed a promising option to fuel a Super bomb would be to use tritium, a superheavy isotope of hydrogen.

From "Big Science" by Michael Hiltzik

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023