You know what it looks like… but what is it called?
TAKE THE QUIZ“filum”
The following 3 entries include the term filum.
ad filum aquae
: to the middle of the stream —often used in conveyancing in describing boundaries
filum aquae
noun: the thread of a stream
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