How to Say "keystone" in Spanish
The Spanish word for “keystone” is “clave” — B2 level.
English → SpanishB2
nounB2
architecture (rare)

Examples
La clave de sol indica las notas altas.
The treble clef indicates the high notes.
El director de orquesta explicó la diferencia entre la clave de sol y la clave de fa.
The orchestra conductor explained the difference between the treble clef and the bass clef.
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