-gram 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 ). Cf. -graph .
[ -gramma, comb. form of grámma something written or drawn; akin to CARVE ]
-gram 2
a combining form of gram 1 : kilogram.
-gram 3
a combining form extracted from telegram , used in the formation of compound words that have the general sense "message, bulletin": culturegram; electiongram; prophecy-gram.