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Definition of Helium
1. Noun. A very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas).
Generic synonyms: Chemical Element, Element, Argonon, Inert Gas, Noble Gas
Definition of Helium
1. n. A gaseous element found in the atmospheres of the sun and earth and in some rare minerals.
2. n. An inert, monoatomic, gaseous element occurring in the atmosphere of the sun and stars, and in small quantities in the earth's atmosphere, in several minerals and in certain mineral waters. Symbol, He; at. wt., 4. Helium was first detected spectroscopically in the sun by Lockyer in 1868; it was first prepared by Ramsay in 1895. Helium has a density of 1.98 compared with hydrogen, and is more difficult to liquefy than the latter. Chemically, it belongs to the argon group and cannot be made to form compounds. It is a decomposition product of the radium emanation.
Definition of Helium
1. Noun. A colorless and inert gas, and the second lightest chemical element (''symbol'' He) with an atomic number of 2 and atomic weight of 4.002602. ¹
2. Noun. A form or sample of the element. ¹
¹ Source: wiktionary.com
Definition of Helium
1. a gaseous element [n -S]
Medical Definition of Helium
1.
Lexicographical Neighbors of Helium
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