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aspirate in phonetics, to pronounce (a speech sound) with an audible release or rush of air, as the "h" in "helium" or the "p" in "pickle". [1/5 definitions]
balloon a bag made of rubber or other light, strong material that may be filled with air or helium and used as a decoration or toy. [1/8 definitions]
He symbol of the chemical element helium.
hydrogen bomb an extremely powerful bomb whose destructive energy comes from the fusion of hydrogen nuclei under intense heat and pressure, forming helium nuclei.
inert gas any of a group of chemical elements, such as helium and neon, that seldom form compounds with other elements and that are gases at room temperature.
superfluidity the condition of liquid helium below 2.18 degrees Kelvin, characterized by frictionless flow and very high thermal conductivity.