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nabla
noun
nab·la
\ˈnablə\
Definition of nabla
-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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