from
The Collaborative International Dictionary of English v.0.48
Unifilar \U`ni*fi"lar\, a. [Uni- + L. filum a thread.]
Having only one thread; involving the use of only one thread,
wire, fiber, or the like; as, unifilar suspension.
[1913 Webster]
{Unifilar magnetometer} (Physics), an instrument which
consists of a magnetic bar suspended at its center of
gravity by a long thread, constituting a delicate means
for accurately measuring magnetic intensities, also for
determining declinations of the magnetic needle.
[1913 Webster]