noun

• (obsolete) Violent emotion or distraction of mind; excessive grief from anxiety; insanity; madness.
  "Come, let us leave him; in his ireful mood / Our words will but increase his ecstasy."
• (slang) The drug MDMA, a synthetic entactogen of the methylenedioxyphenethylamine family, especially in a tablet form.
• (medicine, dated) A state in which sensibility, voluntary motion, and (largely) mental power are suspended, and the body is erect and inflexible.
  "The instant I drew out my case of instruments, the lady roused herself from her ecstasy, and has never had a similar attack."

verb

• (intransitive) To experience intense pleasure.
• (transitive) To cause intense pleasure in.
  "Ali Agha jumped up, seized the visitor by the shoulder, compelled him to sit down, and, ecstasied by the old man's horror at the scene, filled a tumbler, and with the usual grotesque grimaces insisted upon his drinking it."

noun

• (slang) Alternative letter-case form of ecstasy (“drug”).