syntonic adjective. [sɪn'tɒnɪk] L19.
[In sense 1 from SYN- + TONE noun + -IC. In sense 2 from SYNTONY + -IC.]
1. Electricity. Designating (a system of telegraphy using) electrical instruments which are accurately tuned or adjusted so that one responds only to signals of the frequency emitted by the other. L19.

2. Psychiatry. Designating or exhibiting the responsive, lively type of temperament which is liable to manic-depressive psychosis. E20.

■ 'syntone noun (Psychiatry) a person with a syntonic temperament M20.

■ syntonically adverb E20.

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