There are 2 definitions of -gram in English:

-gram1

Syllabification: -gram

combining form

In nouns denoting something written or recorded (especially in a certain way): cryptogram heliogram

Origin

from Greek gramma 'thing written, letter of the alphabet', from graphein 'write'.

Definition of -gram in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of -gram in English:

-gram2

Syllabification: -gram

combining form

In nouns denoting a novelty greeting or message as a humorous or embarrassing surprise for the recipient: kissogram

Origin

on the pattern of telegram.

Definition of -gram in: