(koil) noun
1. A ring or spiral formed by winding.
2. An involvement; a perplexity.
3. A spiral pipe, or a series of pipes, forming a continuous conduit which reverses two or more times.
4. An induction coil.
—Ruhmkorff coil An induction coil with circuit breaker for use with direct and constant current. [<v.]
—v.t.
1. To wind spirally or in rings; wind round and round.
2. To enwrap with coils, as a lasso or the folds of a boa constrictor.
—v.i.
3. To form rings or coils.
4. To move in spirals, as a hawk. [<OF coillir <L colligere. See COLLECT.]
—coil′er noun

(koil) noun Archaic
Confusion or tumult; turmoil. [Origin unknown]