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Noun: vinculum (vincula,vinculums)  ving-kyu-lum
  1. A bond of union; a tie
  2. A commissure uniting the two main tendons in the foot of certain birds
  3. A straight, horizontal mark placed over two or more members of a compound quantity, which are to be subjected to the same operation

Derived forms: vinculums, vincula

Encyclopedia: Vinculum