The Collaborative International Dictionary of English v.0.48:
Reactance coil \Reactance coil\ (Elec.)
A choking coil.
[Webster 1913 Suppl.]
The Collaborative International Dictionary of English v.0.48:
Choking coil \Choking coil\ (Elec.)
A coil of small resistance and large inductance, used in an
alternating-current circuit to impede or throttle the
current, or to change its phase; -- called also reactance
coil or reactor, these terms being now preferred in
engineering usage.
[Webster 1913 Suppl.] Choky