An Etymological Dictionary of Astronomy and Astrophysics

A suffix meaning “drawn, written,” specialized in meaning to indicate the instrument rather than the written product of the instrument.

Etymology (EN): A suffix, from Gk. -graphos “(something) drawn or written, one who draws or writes,” from graphein “to draw, write.”

Etymology (PE): A suffix from the stem of negârdan, negâštan “to paint, write,” → graph.