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The Collaborative International Dictionary
Unifilar

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.

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.

Wiktionary
unifilar

a. Having or using only one thread.

WordNet
unifilar

adj. having or using only one filament