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|Noun||1.||phone system - a communication system that transmits sound between distant points|
transmission line, cable, line - a conductor for transmitting electrical or optical signals or electric power
central, telephone exchange, exchange - a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
communication system - a system for communicating
MEDLINE - the computer-based telephone system of the United States National Library of Medicine that provides rapid linkage to MEDLARS