urea
urea — noun
1. a white chemical substance that contains nitrogen. Living bodies create it as wa
a white chemical substance that contains nitrogen. Living bodies create it as waste and expel it in urine. Factories can produce it from ammonia. It is put into plant foods and livestock feeds, and used when manufacturing plastics.
The kidneys filter urea from blood and pass it out of the body in urine.
uncountable noun; used with verb 'filter'
Farmers spread granular urea on rice fields before planting to increase the harvest.
collocation: granular urea / spread urea
Niran learned in chemistry class how factories make urea from ammonia and carbon dioxide.
Camille bought a hand cream that contains urea to treat her dry, cracked skin.
- carbamide
the chemical-science name for urea, used mainly in pharmaceutical and laboratory settings
文法句型
uncountable noun — no plural form; used with singular verbs
用法筆記
Because urea is a substance, it is uncountable and has no plural form. It appears most often in science, farming, and manufacturing contexts rather than everyday conversation.