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Show words looked up
Word |
# |
Date |
Definition |
Site |
Level |
| helium |
1 |
today |
a chemical element of the inert gas group that contains two protons in each nucleus and that occurs as a lighter-than-air gas often used for lifting power and in air-free atmospheres where an inert gas is required, as in welding. (symbol: He) |
Main |
Adv. |