\Vin"cu*lum\, n.; pl. L. {Vincula}, E. {Vinculums}.
[L., from vincire, vinctum, to bind.]
1. A bond of union; a tie.
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} - vinc{x + y}.
3. (Anat.) A band or bundle of fibers; a fr[ae]num.
4. (Zo["o]l.) A commissure uniting the two main tendons in
   the foot of certain birds.