D defs.my
Entry 1 sense Webster, 1913

-graph

/(-grȧf)/ · IPA
01 A suffix signifying something written (as in digraph), a writing; also, a writer or an instrument that produces a written or visible record…
  1. 1.
    A suffix signifying something written (as in digraph), a writing; also, a writer or an instrument that produces a written or visible record of a measurement, such as a spectrograph; as, autograph, crystograph, telegraph, photograph. See: digraph