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nabla

noun nab·la \ ˈnablə \

Definition of nabla

plural -s
1 :an ancient stringed instrument probably like a Hebrew harp of 10 or 12 strings — called also nebel
2
[probably so called from the resemblance of its symbol, the inverted Greek delta, to a harp]
:del

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Origin and Etymology of nabla

Greek, of Semitic origin; akin to Hebrew nēbhel harp

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