Vinculum
Pronunciation : Vin"cu*lum, n.; pl. L. Vincula
Part of Speech : E.
Etymology : [L., from vincire, vinctum, to bind.]
Definition : 1. A bond of union; a tie.
2. (Math.)
Defn: 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. (Anat.)
Defn: A band or bundle of fibers; a fr?num.
4. (Zo?l.)
Defn: A commissure uniting the two main tendons in the foot of certain birds.
Vinculums.
Source : Webster's Unabridged Dictionary, 1913