[f. Gr. καρδία heart + -φωνία, f. φωνή voice.] The title given to a collection of letters by the Rev. John Newton (1781), intended to mean ‘utterance of the heart,’ in which sense it has been occas. used by later writers.
1781. J. Newton (title), Cardiphonia, or Utterance of the Heart.
1881. Contemp. Rev., 330. The work [In Memoriam] … became at once a text-book and a cardiphonia.
