1. (of a chemical reaction or compound) occurring or formed with the liberation of heat
   - exothermic, heat-releasing

See also: energy-releasing, exoergic

• four-petalled
• four-ply
• four-poster
• four-pounder
• four-pronged
• four-sided
• four-spot
• four-stroke engine
• four-stroke internal-combustion engine
• four-tailed bandage
• four-wheel
• four-wheel drive
• four-wheeled
• four-wheeler
• four-wing flying fish
• four-year-old
• fourchette
• Fourdrinier
• fourfold
• fourfold point correlation
• fourhanded
• Fourier
• Fourier analysis
• Fourier series
• fourpence