Diethanolamine, often abbreviated as DEA or DEOA, is an organic compound with the formula HN(CH₂CH₂OH)₂. Pure diethanolamine is a white solid at room temperature, but its tendency to absorb water and to supercool mean it is often encountered as a colorless, viscous liquid. Diethanolamine is polyfunctional, being a secondary amine and a diol. Like other organic amines, diethanolamine acts as a weak base. Reflecting the hydrophilic character of the alcohol groups, DEA is soluble in water. Amides prepared from DEA are often also hydrophilic.