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Word |
# |
Date |
Definition |
Site |
Level |
| nitrogen |
1 |
today |
a chemical element that has seven protons in each nucleus and that occurs as a colorless, odorless gas that comprises about eighty percent of the earth's atmosphere, or in important compounds such as nitrates, proteins, nucleic acids, and ammonia. (symbol: N) [3 definitions] |
Main |
Adv. |