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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

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

From Science Daily • Feb. 13, 2024

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

From Science Daily • Feb. 13, 2024

Some have wondered if this new generation of superheavy lift vehicles is needed at all and whether multiple smaller launchers could send spacecraft components into orbit for subsequent assembly by astronauts or robots.

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