- maths another name for del
C19: from Greek nabla stringed instrument, because it is shaped like a harp
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for nabla
Nabla told her, and the woman said, "I'll spin the silk for you if you ask me to the wedding."
He heard the mother beating and scolding, and Nabla crying and pleading within.
When the Prince heard this he believed that she was one of Nabla's poor friends.
Scarabus with hawk-headed gryphon, having before in the urus and the nabla or guitar, hieroglyphic of good.
The King's son helped Nabla to a seat behind him on the horse's back and bidding adieu to the widow, rode off.