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1879 R. E. Thompson Physical Exam. Chest vii. 47 Sounds that have more resonance are called hyper-resonant; those that have less, sub-resonant.

1924 Musical Q. 10 44 But if the air column is shortened in one fossa through obstructions, the tone is dampened and sub-resonant.

1965 Nature 21 Aug. 853/1 (heading) Sub-resonant response of a mechanical system parametrically excited at its resonant frequency.

2004 Ultrasound Med. & Biol. 30 1499/1 A variety of insonation frequencies were used, corresponding to resonant, subresonant and super-resonant regimes.