VINCULUM

‖Vin″cu‐lum (?), n.; pl. L. Vincula (#), E. Vinculums (#). [[L., from vincire, vinctum, to bind.]] 1. 1. A bond of union; a tie.
2. 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 x2 + y2 - x + y.
3. 3. (Anat.) A band or bundle of fibers; a frænum.
4. 4. (Zoöl.) A commissure uniting the two main tendons in the foot of certain birds.