1. Vitally important
   - life-and-death

See also: crucial, important

• ADP
• ADP system
• adpressed
• ADPS
• adrenal
• adrenal cortex
• adrenal cortical steroid
• adrenal gland
• adrenal medulla
• adrenalectomy
• Adrenalin
• adrenaline
• adrenarche
• adrenergic
• adrenergic agonist eyedrop
• adrenergic drug
• adrenocortical
• adrenocorticotrophic
• adrenocorticotrophic hormone
• adrenocorticotrophin
• adrenocorticotropic
• adrenocorticotropic hormone
• adrenocorticotropin
• adrenosterone
• Adrian