Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
  • Ballentine's Law Dictionary

    To the thread or center of the stream.

  • Black's Law Dictionary: 2nd Edition

    To the thread of the water; to the central line or middle of the stream. Usque ad fllum aquæ, as far as the thread of the stream. Bract, fol. 208b; 235a. A phrase of frequent occurrence in modern law; of which ad medium fllum a quæ (q. v.) is another form.