circular dichroism

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noun Optics.

selective absorption of one of the two possible circular polarizations of light.

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IS and ARE are both forms of which verb?

Origin of circular dichroism

First recorded in 1960–65

Steve Garth, who works in Circular Quay, was inside the Cartier jewelry store near the café when the siege began.
Jihadi Siege in Sydney Ends in Gunfight|Courtney Subramanian, Lennox Samuels, Chris Allbritton|December 15, 2014|DAILY BEAST
In the background, you can see two movers rolling out a large, circular blue ISIS sign.
‘Archer’ Drops ISIS: The FX Series Dumps the Spy Org’s Name in Light of Recent Events|Marlow Stern|October 11, 2014|DAILY BEAST
We start to argue some points but they are overly defensive and their answers are circular.
Our Trip to The Climate War's Ground Zero|Darren Aronofsky|September 19, 2014|DAILY BEAST
The dugout was covered with semi-circular sheets of corrugated iron, forming a vaulted roof.
Life Under Air Strikes: Children Under Fire Will Never Forget — or Forgive|Clive Irving|August 3, 2014|DAILY BEAST

He uses a spatula to flatten the onions and the meat together, creating a broad circular patty with an uneven edge.
The Most American Pit Stop in the U.S.A.|Jane & Michael Stern|July 21, 2014|DAILY BEAST
The road descended on the other side, and we followed it till we came unexpectedly upon a little circular park.
Music-Study in Germany|Amy Fay
Her eye fastened on a circular portion of the wall-paper pattern, and she felt that the whole room was revolving about her.
Hilda Lessways|Arnold Bennett
You see, all the swells sat in their boxes and gazed right down on the dancers, who had a circular place roped off for them.
Music-Study in Germany|Amy Fay
In the nine differently colored circular tracks, rolled little globes representing the planets.
Fee of the Frontier|Horace Brown Fyfe
The sound holes may have been traced down and even the upper and lower circular holes bored.
Antonio Stradivari|Horace William Petherick