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-turb- means "that which spins or twirls around, a top, to spin around as if in a crowd, to throw into confusion".

imperturbable adj. (im-, not + per-, through + -turb-, to throw into confusion + -able, able, Qu, T) Not easily perturbed or excited or upset; marked by extreme calm and composure.

perturb v. (per-, through + -turb-, to throw into confusion) To disturb; to agitate; to vex, to trouble; to disquiet.

perturbation n. (perturb + -ation, C, A, R, S) The act of perturbing or the state of being perturbed; especially, agitation of the mind; disturbance; discomposure; trepidation; worry.

turbid (GRE) adj. (L. turbidus, troubled, disturbed, from turbare, to trouble, from turba, a crowd.) Having the lees, sediment, or dregs disturbed; muddy; thick; not clear; foul; applied to liquids. Figuratively, confused; vexed; disquieted; disturbed.

turbulence (GRE) n. (L. turbulentus, full of commotion or disturbance.) The quality or state of being turbulent; a disturbed state; tumult; disorder; agitation; commotion.

(disturb, ethmoturbinal, nasoturbinal, trouble, Turbellaria, turbinado, turbinate, turbine, turbinella, Turbo, turbocharger, turbofan, turbojet)

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14y ago

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