• Webster's Revised Unabridged Dictionary
    • n Syntonizer (Physics) One that syntonizes; specif., a device consisting essentially of a variable inductance coil and condenser with a pair of adjustable spark balls, for attuning the time periods of antennæ in wireless telegraphy (called also syntonizing coil ).
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Century Dictionary and Cyclopedia
    • n syntonizer A device for the electric tuning or adjustment to resonance of circuits used in producing and receiving electric oscillations. See syntonism and syntonic.
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In literature:

Professor Braun's syntonic system, the receiver and transmitter of which have been described, is also in one form a non-earthed system.
"Hertzian Wave Wireless Telegraphy" by John Ambrose Fleming