ETYM Latin circularis, from circulus circle: cf. French circulaire. Related to Circle.
Marked by or moving in a cycle.

ETYM Cf. French cycluque, Greek kyklikos, from kyklos See Cycle.
1. Recurring in cycles; SYN. cyclical.
2. Marked by repeated cycles.
3. Chemistry: having atoms arranged in a ring structure.
4. Botany: forming a whorl or having parts arranged in a whorl.

That which occurs in cycles.

ETYM Latin turbulentus, from turba disorder, tumult: cf. French turbulent. Related to Turbid.
1. Disturbed; agitated; tumultuous; roused to violent commotion.
2. Disposed to insubordination and disorder; restless; unquiet; refractory.
3. Producing commotion; disturbing; exciting.