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The 38 pages that link to Urea, each with the reason it gives.

• AmmoniaRelated: Ammonia reacts with carbon dioxide to manufacture urea, a major fertilizer.

• Organic chemistryBroader topic: Its laboratory preparation from an inorganic salt helped undermine vitalist explanations.

• VitalismBroader topic: Its laboratory synthesis became a landmark in the decline of chemical vitalism.

• AmideRelated: Urea is a simple, widespread carbonyl compound containing two amide-like C–N bonds.

• Haber processBroader topic: Industrial ammonia reacts with carbon dioxide to make this major fertilizer product.

• Friedrich WöhlerBroader topic: The compound Wöhler made from ammonium cyanate in his celebrated 1828 experiment.

• Nitrogen fertilizerBroader topic: Its high nitrogen content makes urea a common fertilizer, though it can volatilize.

• Uric acidCompared with: Humans convert most nitrogen waste to urea, whereas uric acid is a smaller waste pathway.

• Urea cycleBroader topic: It is the cycle’s final nitrogenous product, carried in blood to the kidneys.

• Organic compoundBroader topic: Its laboratory synthesis became a landmark in the history of organic chemistry.

• UrineRelated: It is a major dissolved waste product in urine.

• HumectantBroader topic: At suitable concentrations, it hydrates skin and can soften thickened areas.

• Synthetic fertilizerBroader topic: It is the most widely used solid nitrogen fertilizer, made from ammonia and carbon dioxide.

• Ammonium sulfateCompared with: Urea contains more nitrogen by mass and does not directly supply sulfate.

• Selective catalytic reductionRelated: Diesel systems commonly inject urea, which decomposes to form SCR's active reductant.

• Ammonia synthesisRelated: It is a major fertilizer product made using ammonia as a feedstock.

• MelamineCompared with: Both compounds contain substantial nitrogen, but urea is a normal metabolic waste product and melamine is not.

• MoisturizerRelated: Urea formulas can hydrate dry skin and soften thickened scale.

• Urea-formaldehyde resinRelated: Its amino groups react with formaldehyde to form the resin’s molecular structure.

• UremiaRelated: Blood urea is routinely measured, but its concentration alone does not capture the full uremic syndrome.

• Bull sharkRelated: Bull sharks alter urea retention as salinity changes, helping maintain osmotic balance.

• Greenland sharkRelated: High urea levels help Greenland sharks maintain body-fluid balance in seawater.

• Keratosis pilarisRelated: Urea-containing creams can soften keratin buildup and relieve roughness.

• Barbituric acidRelated: Urea supplies the nitrogen-containing component in the classical synthesis of barbituric acid.

• Calcium cyanamideRelated: Calcium cyanamide hydrolysis can ultimately yield this widely used nitrogen product.

• Calcium nitrateCompared with: Unlike calcium nitrate, urea supplies nitrogen without nitrate or calcium ions.

• Diammonium phosphateCompared with: It supplies nitrogen but contains no phosphorus and is not an ammonium salt.

• FormamideCompared with: Urea has two amino groups on one carbonyl carbon, unlike formamide's one.

• James B. SumnerRelated: Urease acts on urea, allowing Sumner to assay enzyme activity during purification.

• AcetamideRelated: Like acetamide, urea is a small, hydrogen-bonding amide compound used in chemical manufacture.

• AllantoinRelated: Urea is released during allantoin degradation in several metabolic pathways.

• GuanidineCompared with: Replacing guanidine’s imine nitrogen with oxygen changes basicity and biological role.

• HexamethylenetetramineCompared with: Both are nitrogen-rich molecules, but urea is an open-chain carbonyl compound rather than a cage.

• ThioureaCompared with: Replacing urea’s oxygen with sulfur gives thiourea its defining structural relationship.

• UrophagiaRelated: The kidneys must remove urea, and reingesting it adds to the body's waste burden.

• Ammonia solutionRelated: Ammonia is a principal nitrogen-containing reactant in industrial urea manufacture.

• Carbamic acidRelated: Urea is the dehydration product of carbamic acid and ammonia in a familiar reaction scheme.

• Sodium dodecyl sulfateCompared with: Urea denatures proteins without adding sodium dodecyl sulfate’s strong negative charge.