20-letter words containing x, o, a, n
- sex change operation — a surgical operation designed to change a person's physical sexual characteristics to those of the opposite sex
- toxemia of pregnancy — an abnormal condition of pregnancy characterized by hypertension, fluid retention, edema, and the presence of protein in the urine.
- trailing vortex drag — drag arising from vortices that occur behind a body moving through a gas or liquid
- uranium hexafluoride — a colorless, water-insoluble, crystalline, volatile solid, UF 6 , used in its gaseous state in separating uranium 235 from uranium.