tongue-keyn. in Exper. Psychol., a reaction-key which is opened or closed by movement of the tongue.
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tongue-key1902
1902 J. M. BaldwinDict. Philos. & Psychol. II. 419/2 The most common form of motor response is the act of pressing a telegrapher's key with the finger or hand. Other forms are with the lip key, tongue key, and mouth or voice key.