hafnium

[ haf-nee-uhm, hahf- ]

/ ˈhæf ni əm, ˈhɑf- /

noun Chemistry.

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

1923; <New Latin Hafn(ia) Copenhagen + -ium

Words nearby hafnium

Ha-erh-pin, haet, haffet, Haffkine, hafiz, hafnium, haft, Haftarah, Hafun, hag, Haganah

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for hafnium

hafnium

/ (ˈhæfnɪəm) /

noun

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

Word Origin for hafnium

C20: New Latin, named after Hafnia, Latin name of Copenhagen + -ium

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

Medical definitions for hafnium

hafnium

[ hăf′nē-əm ]

n. Symbol Hf

A metallic element found with zirconium and used in nuclear reactor control rods and in tungsten alloys used in filaments. Atomic number 72.

Scientific definitions for hafnium

hafnium

[ hăf′nē-əm ]

Hf

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.

单词	hafnium
释义	hafnium [ haf-nee-uhm, hahf- ] / ˈhæf ni əm, ˈhɑf- / noun Chemistry. 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 1923; <New Latin Hafn(ia) Copenhagen + -ium Words nearby hafnium Ha-erh-pin, haet, haffet, Haffkine, hafiz, hafnium, haft, Haftarah, Hafun, hag, Haganah Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for hafnium hafnium / (ˈhæfnɪəm) / noun 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 Word Origin for hafnium C20: New Latin, named after Hafnia, Latin name of Copenhagen + -ium 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 Medical definitions for hafnium hafnium [ hăf′nē-əm ] n. Symbol Hf A metallic element found with zirconium and used in nuclear reactor control rods and in tungsten alloys used in filaments. Atomic number 72. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for hafnium hafnium [ hăf′nē-əm ] Hf 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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