usque ad filum aquae

usque ad fi·​lum aquae | \-ˈfēləˈmäˌkwī, ˈfīləˈmāˌkwē\

Definition of usque ad filum aquae 

: 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

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History and Etymology for usque ad filum aquae

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

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to make faulty or ineffective

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