| Noun | 1. | Decadron - a corticosteroid drug (trade names Decadron or Dexamethasone Intensol or Dexone or Hexadrol or Oradexon) used to treat allergies or inflammationadrenal cortical steroid, corticoid, corticosteroid - a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response; "adrenal cortical steroids are used to treat many different conditions" | |