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Helium

/ˈhiːli.əm/

The second lightest chemical element (symbol He) with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.

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📖 Definitions of "Helium"

noun

1
The second lightest chemical element (symbol He) with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
2
A form or sample of the element.

🔄 Synonyms of "Helium"

2 synonyms found via WordNet and Google Books.

Word	Definition
henoun	(informal) A male.
atomic number 2noun	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)

💡 Words with a Similar Meaning to "Helium"

Found via reverse dictionary — words that share a conceptual meaning.

Word	Definition
henoun	(informal) A male.
atomic number 2noun	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)
neonnoun	(countable, uncountable) Neon signs or lights, collectively.
gasnoun	(uncountable, physical chemistry) Matter in an intermediate state between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid, or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly by deposition.
superfluidnoun	(physics) A substance, such as liquid helium, that exhibits superfluidity.
element 2	—
rare gasnoun	Synonym of noble gas.
inert gasnoun	(chemistry, specifically) A noble gas.
noble gasnoun	(chemistry) Any of the elements of group 18 of the periodic table, being monatomic, usually inert (with very limited exceptions), and gaseous at familiar temperatures.
alpha particlenoun	(physics) A doubly positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity.
monatomic gas	In physics and chemistry, "monatomic" is a combination of the words "mono" and "atomic", and means "single atom".
liquid heliumnoun	(physics) The liquified form of helium that does not solidify even at absolute zero; it shows unusual properties, such as superfluidity, due to quantum effects.
coolantnoun	A medium, usually fluid, used to draw heat from an object.
cryogennoun	(physics) a cryogenic liquid (that boils below about -160°C) used as a refrigerant
lifting gasnoun	A gas, such as helium or hydrogen, that is used to produce buoyancy for e.g. balloons or airships.
helium-3noun	(physics) The rare isotope of helium, ³₂He, that has a single neutron.
helium-4noun	(physics) The normal isotope of helium, ⁴₂He, that has two neutrons.
hydrogennoun	The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
helionnoun	(physics, usually) A helium-3 ion, the nucleus of a helium-3 atom. Formula: ³He⁺².
helium hydridenoun	(inorganic chemistry) Ellipsis of helium hydride cation, the unstable binary cation HeH⁺ present in interstellar space; it is the strongest acid, reactive with every chemical species except positive ions, including electrons.