noun Pharmacology.
  1. a toxic orange powder, C14H10N4O5, used to control muscle spasms, as in the treatment of local trauma, multiple sclerosis, cerebral palsy, or other neurological disorders.

Origin of dantrolene

dantrol-, contracted from letters of the chemical name + -ene
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018