There are 2 definitions of -gram in English:

-gram1

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'.

Derivatives

-grammatic

Pronunciation: /grəˈmatɪk/
combining form
In corresponding adjectives.

Definition of -gram in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something

There are 2 definitions of -gram in English:

-gram2

combining form

In nouns denoting a person paid to deliver a novelty greeting or message as a humorous surprise for the recipient: kissogram

Origin

on the pattern of telegram.

Definition of -gram in: