noun
Usage: usually capitalized L
Etymology: translation of Greek harmonia lydia
1. : a Greek mode consisting of two disjunct tetrachords represented on the white keys of the piano by a descending diatonic scale from C to C — see greek mode illustration
2.
[translation of Medieval Latin modus Lydius ]
: an authentic ecclesiastical mode represented on the white keys of the piano by an ascending diatonic scale from F to F — see mode illustration