hy·dro·cor·ti·sone 
(hī′drə-kôrtĭ-sōn′, -zōn′)
(hī′drə-kôrtĭ-sōn′, -zōn′)n.
1. The steroid hormone cortisol.
2. A preparation of this hormone obtained from natural sources or produced synthetically and used to treat inflammatory and allergic conditions and adrenal failure.