-graph

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CIDE DICTIONARY

-graph, [From Gr. gra`fein to write. See Graphic.].

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. [1913 Webster]

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OXFORD DICTIONARY

-graph, comb. form forming nouns and verbs meaning:
1 a thing written or drawn etc. in a specified way (autograph; photograph).
2 an instrument that records (heliograph; seismograph; telegraph).

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