a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths

haracterized by very careful or fastidious selection, Of or pertaining to the process of selection, Selecting; tending to select

a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade names Prozac or Sarafem); it is thought to work by increasing the activity of serotonin in the brain, proper trademark A trade name for the drug fluoxetine