telegraph; telegram; telegraphy
Refers to the technology of telegraphy, the act of sending a telegram, or the message itself. Often used in historical or technical contexts; modern communication is usually メール or メッセージ.
In the past, they used telegraphs to communicate overseas.
He sent a congratulatory message by telegram.
My father sent a telegram to his family from the battlefield.
He informed them of his safe arrival by telegraph.
That night, a telegram arrived from a distant town.