Ad Filum Aquae
Defined in 2 dictionaries — Cyclopedic (1922), Ballentine's (1916)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
To the thread of the stream; to the middle of the stream. 2 Cush. (Mass.) 207; 4Hill (N. Y.) 369; 2 N. H. 369; 2 Washb. Real Prop. 632, 633; 3 Kent, Comm. 423 et seq. A former meaning seems to have been, to a stream of water. Cowell-; Blount. Ad ten used; but the common use of ad filum aquae is undoubtedly to the thread oif the stream (3 Sumn. [U. S.] 170; 1 Mc Cord [S. C] 580; 3 Kent, Comm. 431; 20 Wend. [N. y.] 149; 4 Pick. [Mass.] 272). AD FILUM VIAE (Lat.) To the middle of the way. 8 Mete. (Mass.) 260. AD FINEM (Lat., abbreviated ad fin.) To the end.
Ballentine's Law Dictionary
James A. Ballentine · 1916
To the thread or center of the stream.