• Webster's Revised Unabridged Dictionary
    • n Perturber One who, or that which, perturbs, or cause perturbation.
    • ***
Century Dictionary and Cyclopedia
    • n perturber One who perturbs; a perturbator; a disturber.
    • ***
Chambers's Twentieth Century Dictionary
    • ns Perturber :—fem. Per′turbātrix
    • ***


Chambers's Twentieth Century Dictionary
Fr.,—L. perturbāre, -ātumper, thoroughly, turbāre, to disturb—turba, a crowd.


In literature:

I was shy and perturbed, but horribly fascinated.
"Greenmantle" by John Buchan
The Scots Fusiliers looked perturbed, as if they were in doubt of his meaning.
"Mr. Standfast" by John Buchan
The succeeding half-hour's conversation was not of a nature to calm his perturbed spirit.
"The Pickwick Papers" by Charles Dickens
The more I thought upon the matter the greater became my perturbation.
"Pellucidar" by Edgar Rice Burroughs
He was led into another room, Major Campbell following, in great distress and perturbation of mind.
"Memoirs of Extraordinary Popular Delusions" by Charles Mackay
Wolf's perturbation began to wax.
"Love of Life and Other Stories" by Jack London
In his perturbation he failed to hear and see her invitation to a seat.
"Burning Daylight" by Jack London
Then wild animals howled, and "Ring" was perturbed in spirit about them.
"A Lady's Life in the Rocky Mountains" by Isabella L. Bird
His looks were grave, but not without perturbation.
"Wieland; or The Transformation" by Charles Brockden Brown
One day Sir Walter Farquhar called on him in great perturbation.
"The Wedding Ring" by T. De Witt Talmage

In poetry:

I will not perturbate
Thy Paradisal state
With praise
Of thy dead days;
"To The Dead Cardinal Of Westminster" by Francis Thompson
Its grasses by the top;
The rains thereon that drop
With drip acerb
"To The Dead Cardinal Of Westminster" by Francis Thompson
An agitation of the air,
A perturbation of the light
Admonished me the unloved year
Would turn on its hinge that night.
"End Of Summer" by Stanley Kunitz
How I am pleased with thee, sweet girl! But do
Shake off this perturbation, be not anxious,
Be not alarmed, I want to hear thee talk -
Be cheerful.
"Nathan The Wise - Act V" by Gotthold Ephraim Lessing
These perturbations, this perpetual jar
Of earthly wants and aspirations high,
Come from the influence of an unseen star,
An undiscovered planet in our sky.
"Haunted Houses. (Birds Of Passage. Flight The First)" by Henry Wadsworth Longfellow
When this was told to CAPTAIN TODD,
At first he thought it rather odd,
And felt some perturbation;
But very long he did not grieve,
He thought he could a way perceive
To SUCH a situation!
"The Sensation Captain" by William Schwenck Gilbert

In news:

It doesn't perturb me much because I'm used to being disquieted by Fornes's works.
Researchers Provide Systems-Level Dissection of Regulatory Perturbations in Cancer.
A worried-looking Demi Moore looks perturbed in between takes on the set.
Kinases have been the target of extensive research, and there has been significant interest in developing assays that measure the endogenous activities of kinases and their perturbation by small molecules.
At one heated point in Monday night's South Carolina Democratic debate, a perturbed Barack Obama finally blurted out to Hillary Clinton what millions of others have been thinking these past weeks.
And an internationally acknowledged expert on the applied- mathematics technique known as perturbation, died April 17 at Albany Medical Center Hospital.
Results To address this question, we perturbed the activity of the 'pyloric' ventricular dilator neuron and the 'gastric' lateral gastric neuron during ongoing pyloric and gastric rhythms.
Poet perturbed by MLK paraphrase.
You know the one — full-sized American steel with a low-profile tow rack in the bed, the claws of which protrude out of the tailgate like a perturbed crab looking to pinch pinch a car.
Perturbations to their structures caused by mysterious rocketing objects.
Those perturbations tip the researchers that a sunspot is forming.
Those perturbations are what tip the researchers that a sunspot is forming.
Our company recently implemented a policy that has quite a few people perturbed, myself included.
Mention nurses in the Bay Area these days and two images come to mind: a caring, nurturing professional at a patient's bedside, and a perturbed, bullhorn carrying protester walking a picket line.
Preseason or not, there's nothing easier to predict than Rick Carlisle being perturbed after a poor defensive performance.

In science:

We admit step by step larger perturbations of a given Clifford structure ((E , h, ∇h) −→ (M n , g )) where the perturbations E ′ = ((E ′ , h′ , ∇h′ ) −→ (M ′ n , g ′)) are elements of gen comp(E ).
Relative Zeta Functions, Determinants, Torsion, Index Theorems and Invariants for Open Manifolds
Fixing gen comp(E ) has the consequence that we start with (E , h, ∇h) −→ (M n , g ), fix the vector bundle E −→ M and admit step by step perturbation of ∇h , then simultaneously of g , h, ∇h , · and finally compact topological perturbations.
Relative Zeta Functions, Determinants, Torsion, Index Theorems and Invariants for Open Manifolds
Nevertheless, the discussion of more general perturbations is modelled by the case of ∇–perturbation.
Relative Zeta Functions, Determinants, Torsion, Index Theorems and Invariants for Open Manifolds
Finally the last class of admitted perturbations are compact topological perturbations which will be the content of the next section.
Relative Zeta Functions, Determinants, Torsion, Index Theorems and Invariants for Open Manifolds
We define the notions of perturbative/non-perturbative regimes and in particular we explain the adiabatic/sudden limits.
Quantum Irreversibility of Energy Spreading