" coil "

[Noun]  | "coil" | \ ˈkȯi(-ə)l \

1: turmoil

2: trouble; also : everyday cares and worries

Origin: 1567 ;

 Origin unknown;

[Noun]  | "coil" 

1: a series of loops

2: spiral

3: a single loop of such a coil

Origin: 1661 ;

[Noun]  | "choke coil" 

1: reactor

Origin: circa 1896 ;

[Noun]  | "induction coil" 

1: an apparatus for obtaining intermittent high voltage that consists of a primary coil through which the direct current flows, an interrupter, and a secondary coil of a larger number of turns in which the high voltage is induced

Origin: 1837 ;

[Noun]  | "Tesla coil" 

1: an air-core transformer for high-frequency alternating or oscillating electrical currents

Origin: 1896 ;

 After Nikola Tesla †1943 American (Croatian-born) electrician and inventor;

[Noun]  | "primary" 

1: something that stands first in rank, importance, or value : fundamental —usually used in plural

2: the celestial body around which one or more other celestial bodies revolve; especially : the more massive usually brighter component of a binary star system

3: one of the usually 9 or 10 strong flight feathers on the distal joint of a bird's wing

Origin: 1656 ;

 In part borrowed from Late Latin prīmārius "person leading, leader," noun derivative of Latin prīmārius "of the highest importance or station, chief, {see: |primary:1|primary:1}"; in part noun derivative of {see: |primary:1|primary:1}, or shortened from collocations with the adjective; (sense 5) shortened from primary election, earlier primary assembly, translation of French assemblée primaire;

[Noun]  | "secondary" 

1: one occupying a subordinate or auxiliary position rather than that of a principal

2: a defensive football backfield

3: the coil through which the secondary current passes in an induction coil or transformer —called also secondary coil

Origin: 15th century ;

[Verb]  | "coil" 

1: to wind into rings or spirals

2: to roll or twist into a shape resembling a coil

3: to move in a circular or spiral course

Origin: 1611 ;

 French coillir, cuillir to gather {mat|cull|};

[Noun]  | "coil" 

[Verb]  | "coil"