usque ad filum aquae

usque ad fi·​lum aquae

-ˈfēləˈmäˌkwī,

ˈfīləˈmāˌkwē

: as far as the middle of the stream

—referring to a rule in law that when a boundary of a real property is formed by a nontidal stream, unless otherwise evident, the title extends to an imaginary line along the middle of the stream subject to the rights of the public

Word History

Etymology

Medieval Latin, literally, as far as the thread of water

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