Enter a clue or pattern or both:

The Clue

Piano soundboard, e.g. (9 letter answer)

The Answer

RESONATOR

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Notes

The answer RESONATOR is so rare that it appears less than once every 2500 puzzles.

Definition

RESONATOR as a noun:

1. (resonator, cavity resonator, resonating chamber) = a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves
2. (resonator, resonant circuit) = an electrical circuit that combines capacitance and inductance in such a way that a periodic electric oscillation will reach maximum amplitude
3. any system that resonates