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The Collaborative International Dictionary of English v.0.48:

Del \Del\, n. [See Deal, n.] Share; portion; part. [Obs.] --Chaucer. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

del \del\ n. (Math.) a differential operator which, operating on a function of several variables, gives the sum of the partial derivatives of the function with respect to the three orthogonal spatial coordinates; -- also called the gradient or grad. It is represented by an inverted Greek capital delta ([nabla]), and is thus because of its shape also called nabla, meaning harp in Hebrew. [PJC]