-gram

CIDE DICTIONARY

-gram,  [Gr. ? a thing drawn or written, a letter, fr. gra`fein to draw, write. See Graphic.].

 A suffix indicating something drawn or written, a drawing, writing; -- as, monogram, telegram, chronogram.  [1913 Webster]

OXFORD DICTIONARY

-gram, comb. form forming nouns denoting a thing written or recorded (often in a certain way) (anagram; epigram; monogram; telegram).

Derivative

-grammatic comb. form forming adjectives.

Etymology

from or after Gk gramma -atos thing written, letter of the alphabet, f. grapho write