hafnium
a gray, toxic metallic element with a high melting point (over 2000°C), found in most zirconium minerals. Symbol: Hf; atomic weight: 178.49; atomic number: 72; specific gravity: 12.1.
Origin of hafnium
1Words Nearby hafnium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use hafnium in a sentence
The scientists also looked for different forms of oxygen and hafnium.
Tiny gemstones show when Earth’s crust first started moving | Nikk Ogasa | June 13, 2022 | Science News For StudentsResearchers say that hafnium, a state-sponsored hacking group based in China, started exploiting ProxyLogon in January, and within a few weeks, five other APTs—short for advanced persistent threat groups—followed suit.
Critics fume after Github removes exploit code for Exchange vulnerabilities | Dan Goodin | March 11, 2021 | Ars TechnicaJust days later, Microsoft publicly disclosed the hacks—the hackers are now known as hafnium—and issued a security fix.
How China’s attack on Microsoft escalated into a “reckless” hacking spree | Patrick Howell ONeill | March 10, 2021 | MIT Technology ReviewIt’s possible that the original hafnium group sold or shared their exploit code or that other hackers reverse-engineered the exploits based on the fixes that Microsoft released, Nickels explains.
Four new hacking groups have joined an ongoing offensive against Microsoft’s email servers | Patrick Howell ONeill | March 6, 2021 | MIT Technology Review
British Dictionary definitions for hafnium
/ (ˈhæfnɪəm) /
a bright metallic element found in zirconium ores: used in tungsten filaments and as a neutron absorber in nuclear reactors. Symbol: Hf; atomic no: 72; atomic wt: 178.49; valency: 4; relative density: 13.31; melting pt: 2231±20°C; boiling pt: 4603°C
Origin of hafnium
1Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for hafnium
[ hăf′nē-əm ]
A bright, silvery metallic element that occurs in zirconium ores. Because hafnium absorbs neutrons better than any other metal and is resistant to corrosion, it is used to control nuclear reactions. Atomic number 72; atomic weight 178.49; melting point 2,220°C; boiling point 5,400°C; specific gravity 13.3; valence 4. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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