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From The Collaborative International Dictionary of English v.0.48:
Vinculum \Vin"cu*lum\, n.; pl. L. Vincula, E. Vinculums. [L., from vincire, vinctum, to bind.] 1. A bond of union; a tie. [1913 Webster] 2. (Math.) A straight, horizontal mark placed over two or more members of a compound quantity, which are to be subjected to the same operation, as in the expression x^2 + y^2 - vincx + y. [1913 Webster] 3. (Anat.) A band or bundle of fibers; a fraenum. [1913 Webster] 4. (Zool.) A commissure uniting the two main tendons in the foot of certain birds. [1913 Webster]