1. a colorless, odorless gas that makes up about 78% of Earth’s atmosphere and is essential for plant growth
Usage: chemistry

Examples

• Nitrogen is the most abundant gas in our atmosphere.
• Plants need nitrogen to produce proteins and grow properly.
• Farmers often add nitrogen fertilizer to their crops.
• Lightning can convert atmospheric nitrogen into forms plants can use.
• Liquid nitrogen is extremely cold and used for freezing.
• The nitrogen cycle is important for all living things.