Etymology
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Words related to -graph

-graphy 
word-forming element meaning "process of writing or recording" or "a writing, recording, or description" (in modern use especially in forming names of descriptive sciences), from French or German -graphie, from Greek -graphia "description of," used in abstract nouns from graphein "write, express by written characters," earlier "to draw, represent by lines drawn," originally "to scrape, scratch" (on clay tablets with a stylus), from PIE root *gerbh- "to scratch, carve" (see carve).
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allograph (n.)
"writing made by another person," by 1900, from allo- "other" + -graph "something written." Especially in law, "a deed not written by any of the parties to it." Linguistics sense "form of an alphabetic letter" is from 1951, with second element abstracted from grapheme. Related: Allographic.
cardiograph (n.)

"apparatus for recording by tracing the beating of the heart," 1867, from cardio- + -graph "something written."

Although the work does not treat of the recent means of diagnosis—the thermometer, laryngoscope, cardiograph, etc.,—still it is complete as far as it goes. [book review in Medical Investigator, May 1867, p.94]
chronograph (n.)

"precise time-measuring device," 1831, from chrono- "time" + -graph "instrument for recording; something written." Compare Greek khronographos "recording time and events" (adj.); "a chronicler" (n.). Related: Chronography; chronographic.

cryptograph (n.)

1849, "something written in secret characters;" see crypto- "secret, hidden" + -graph "writing, something written." From 1879 as "system of secret writing."

diagraph (n.)

"instrument for drawing objects without the need for artistic skill," 1847; see dia- + -graph.

It consists of a carriage for a pencil governed by a system of cords and pulleys working at right angles to one another, and set in motion by the movement of a pointer, which is passed by the operator, who is careful to keep his eye at a fixed point of view, around the apparent outlines of his subject. The pencil describes on the paper the exact motions of the pointer, and thus reproduces the desired object. [Century Dictionary]

Earlier it meant "a description" (by 1798).

Dictograph (n.)

in-house, hands-free telephone system using microphones and loudspeakers, patented 1907 in U.S. by K.M. Turner and W. Donnan, from dictation + -graph in the sense of "instrument for recording."

heliograph (n.)
1848, "instrument for taking photographs of the sun," from helio- "sun" + -graph "something written." Earlier, "a description of the sun" (1706, implied in heliographic). From 1877 as the name of a movable mirror used in signaling. Related: Heliographical.

Heliography (1845) was the word for the product of a type of engraving process by chemical reaction from exposure to sunlight. It also was an early term for what came to be called photography (1840).
homograph (n.)
1810 as a method of signalling, from homo- (1) "same" + -graph "something written." Meaning "a word of identical spelling with another, but of different origin and meaning," is from 1873. Related: Homographic; homography. Greek homographos meant "of the same letters."
ideograph (n.)
"character or symbol which suggests an object without expressing its name," 1841, from ideo-, here as a combining form of idea, + -graph "instrument for recording; something written." Related: Ideographic (1822); ideographical.