Based on the Random House Dictionary, © Random House, Inc. 2012.
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| the quantity of product formed by the interaction of two or more substances, generally expressed as a percentage |
| a white, crystalline, slightly water-soluble solid, C3N3(NH2)3, used chiefly in organic synthesis and in the manufacture of resins |
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holmium hol·mi·um (hōl'mē-əm)
n.
Symbol Ho
A soft malleable rare-earth element. Atomic number 67; atomic weight 164.930; melting point 1,472°C; boiling point 2,700°C; specific gravity 8.80; valence 3.
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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holmium  (hōl'mē-əm) Pronunciation Key
Symbol Ho A soft, silvery, malleable metallic element of the lanthanide series. Its compounds are highly magnetic. It is mainly used in scientific research but has also been used to make electronic devices. Atomic number 67; atomic weight 164.930; melting point 1,461°C; boiling point 2,600°C; specific gravity 8.803; valence 3. See Periodic Table. |
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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holmium
(Ho), chemical element, rare-earth metal of the lanthanoid series of the periodic table, one of the most paramagnetic substances known. Among the least abundant of the rare-earth elements, holmium and its compounds have limited application except for research. Holmium has been used as a component of some electronic devices; the ion Ho3+ has been used as a catalyst for ortho-para hydrogen conversion; and the oxide has been used as a special refractory.
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