etymologeek.com dictionary
Modern Greek word τηλεγράφημα comes from English grapheme, Modern Greek (1453-) τηλε-.

Τηλεγράφημα etymology history

Τηλεγράφημα detailed word origin explanation

Dictionary entryLanguageDefinition
grapheme English (eng) A fundamental unit of a writing system, corresponding to (for example) letters in the English alphabet or jamo in Korean Hangeul.. In alphabetic writing, the shortest group of letters composing a phoneme.
τηλε- Modern Greek (1453-) (ell) Tele- (relating to communication at a distance, television, telephony, etc).
τηλεγράφημα Modern Greek (1453-) (ell) Telegram (telegraphed message).