a. [f. UNI- 1 + L. fil-us thread: see -AR1.] Of a magnetometer or other magnetic instrument: Having or suspended by a single thread or fiber.
1856. Kane, Arct. Expl., I. xiv. 153. We had a good unifilar [magnetometer].
1873. J. C. Maxwell, Electr. & Magn., II. 119. The Unifilar Declinometer.
1879. Thomson & Tait, Nat. Phil., I. I. § 435. In the unifilar torsion-balance.
