COIL

v. bind, wrap; twist, wind

n. cylinder, roll; ring, link; wrapping, winding

A coil is a series of s. A coiled coil is a structure where the coil itself is in turn also looping.
See more at Wikipedia.org...

Chemical oxygen iodine laser, or COIL, is an infrared chemical laser. As it is infared, it cannot be seen with the naked eye. It is capable of output power scaling up to megawatts in continuous mode. Its output wavelength is 1.315 µm, the wavelength of transition of atomic iodine.The laser is fed with gaseous chlorine, molecular iodine, and an aqueous mixture of hydrogen peroxide and potassium hydroxide. The aqueous peroxide solution undergoes chemical reaction with chlorine, producing heat, potassium chloride, and oxygen in excited state, with spontaneous lifetime of about 45 minutes. This singlet delta oxygen transfers its energy to the iodine molecules injected to the gas stream; they are nearly resonant with the singlet oxygen, so the energy transfer during the collision of the particles is rapid. The excited iodine then undergoes stimulated emission and lases at 1.315 µm in the  optical resonator region of the laser.
See more at Wikipedia.org...

Coil spiral. coil a winding structure or spiral; called also helix. coiled-coil a protein structure motif marked by amphipathic a-helical regions [more]Coil - Community and Resources

Noun
1. a structure consisting of something wound in a continuous series of loops; "a coil of rope"
(synonym) spiral, volute, whorl, helix
(hypernym) structure, construction
(hyponym) hank
(derivation) gyrate, spiral
2. a round shape formed by a series of concentric circles
(synonym) whorl, roll, curl, curlicue, ringlet, gyre, scroll
(hypernym) round shape
(hyponym) corolla
(derivation) gyrate, spiral
3. a transformer that supplies high voltage to spark plugs in a gasoline engine
(hypernym) transformer
4. a contraceptive device placed inside a woman's womb
(hypernym) contraceptive, preventive, preventative, contraceptive device, prophylactic device, birth control device
5. tubing that is wound in a spiral
(hypernym) tube, tubing
(hyponym) condenser
6. reactor consisting of a spiral of insulated wire that introduces inductance into a circuit
(hypernym) reactor
(hyponym) armature
Verb
1. to wind or move in a spiral course; "the muscles and nerves of his fine drawn body were coiling for action"; "black smoke coiling up into the sky"; "the young people gyrated on the dance floor"
(synonym) gyrate, spiral
(hypernym) turn
(derivation) whorl, roll, curl, curlicue, ringlet, gyre, scroll
2. make without a potter's wheel; "This famous potter hand-builds all of her vessels"
(synonym) handbuild, hand-build
(hypernym) shape, form, work, mold, mould, forge
3. wind around something in coils or loops
(synonym) loop, curl
(antonym) uncoil
(hypernym) wind, wrap, roll, twine
(derivation) whorl, roll, curl, curlicue, ringlet, gyre, scroll

(v. t.)
To wind cylindrically or spirally; as, to coil a rope when not in use; the snake coiled itself before springing.
  

(v. t.)
To encircle and hold with, or as with, coils.
  

(v. i.)
To wind itself cylindrically or spirally; to form a coil; to wind; -- often with about or around.
  

(n.)
Fig.: Entanglement; toil; mesh; perplexity.
  

(n.)
A series of connected pipes in rows or layers, as in a steam heating apparatus.
  

(n.)
A ring, series of rings, or spiral, into which a rope, or other like thing, is wound.
  

(n.)
A noise, tumult, bustle, or confusion.