SOLENOIDS
Noun
solenoids
plural of solenoid
Source: Wiktionary
SOLENOID
So"len*oid, n.Etym: [Gr. -oid.] (Elec.)
Definition: An electrodynamic spiral having the conjuctive wire turned back
along its axis, so as to neutralize that component of the effect of
the current which is due to the length of the spiral, and reduce the
whole effect to that of a series of equal and parallel circular
currents. When traversed by a current the solenoid exhibits polarity
and attraction or repulsion, like a magnet.
Source: Webster’s Unabridged Dictionary 1913 Edition