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-gram1

1.
a combining form occurring in loanwords from Greek, where it meant “something written,” “drawing” (epigram; diagram); on this model, used in the formation of compound words (oscillogram).
Compare -graph.
Origin
< Greek -gramma, combining form of grámma something written or drawn; akin to carve

-gram2

1.
a combining form of gram1 :
kilogram.

-gram3

1.
a combining form extracted from telegram, used in the formation of compound words that have the general sense “message, bulletin”:
culturegram; electiongram; prophecy-gram.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -gram

-gram

combining form
1.
indicating a drawing or something written or recorded: hexagram, telegram
Word Origin
from Latin -gramma, from Greek, from gramma letter and grammē line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for -gram

suffix from telegram (1852), first abstracted 1979 (in Gorillagram, a proprietary name in U.S.), and put to wide use in forming new words, such as stripagram (1981). The construction violates Greek grammar, as an adverb could not properly form part of a compound noun.

Online Etymology Dictionary, © 2010 Douglas Harper
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-gram in Medicine

-gram suff.
Something written or drawn; a record: cardiogram.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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