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nouna 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)
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Definition that contains helium
- am a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms
- cm a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei
- mucus protective secretion of the mucous membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium
- dewar vacuum flask that holds liquid air or helium for scientific experiments
- bk a radioactive transuranic element; discovered by bombarding americium with helium
- pitchblende a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
- longan tree of southeastern Asia to Australia grown primarily for its sweet edible fruit resembling litchi nuts; sometimes placed in genera Euphorbia or Nephelium
- epithelial of or belonging to the epithelium
- berkelium a radioactive transuranic element; discovered by bombarding americium with helium
- curium a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei