noun
Meaning 1
An early device for voice transmission, in which the contact of variable resistance is formed between a fixed piece of platinum and a small carbon lozenge attached to a plate of cork suspended by two springs on the upper part.
Definition source: English Wiktionary via Wiktextract
Usage: historical
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided