plural of grapheme

(linguistics) The study of the graphemes, or writing units, of a script, and of their relation to the phonemes of the spoken language

Of or pertaining to graphemes or their study. / Being or that is a grapheme; being or that is an irreducibly meaningful unit of written language.

A fundamental unit of a writing system, corresponding to (for example) letters in the English alphabet or jamo in Korean Hangeul.

In terms of or by means of graphemes.