1. a colorless crystalline compound that is the main nitrogen-containing waste product of mammals and is excreted in urine
Usage: biochemistry; medical
2. a synthetic form of this compound used as a fertilizer and in plastics
Usage: chemistry; agriculture

Examples

• The kidneys filter urea from the blood.
• High levels of urea in the blood can indicate kidney problems.
• Farmers apply urea fertilizer to increase crop yields.
• Urea is commonly used in the production of plastics and resins.
• The laboratory test measured urea concentration in the patient’s urine.
• Synthetic urea is manufactured on an industrial scale.
• Urea-formaldehyde foam was once used as insulation.