trefoil arch

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noun Architecture.

an arch with cusplike intrados.

QUIZ

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Test how much you really know about regular and irregular plural nouns with this quiz.

Question 1 of 9

Which of the following nouns has an irregular plural form?

Words nearby trefoil arch

On the steps of the old courthouse in the shadow of the arch where Al Sharpton addressed a media horde.
Michael Brown's Hometown Is Under Occupation|Justin Glawe|August 13, 2014|DAILY BEAST
Meanwhile, in the town plaza, arch-rival Brazilian and Argentinian fans were busy hurling insults and beer bottles at one another.
What Is It About Soccer That Brings Out the Hooligan in Its Fans?|Bill Morris|June 25, 2014|DAILY BEAST
This has all fueled attacks against Comstock by her opponents in the primary, who include arch conservative Del.
Republican Congressional Candidate's Awkward Obama Vote|Ben Jacobs|April 17, 2014|DAILY BEAST
In contrast, arch-rival California has lost a half a million.
Forget What the Pundits Tell You, Coastal Cities are Old News - it’s the Sunbelt that’s Booming|Joel Kotkin|March 1, 2014|DAILY BEAST

After a while, as we were arguing about the Thicket, it occurred to us that all in the house save Arch and me had gone to bed.
‘The Land of the Permanent Wave’ Is Bud Shrake’s Classic Take on ‘60s Texas|Edwin Shrake|February 2, 2014|DAILY BEAST
The way was under a double row of tall trees, which met at the top and formed a green arch over our heads.
Music-Study in Germany|Amy Fay
He thought a little longer, and as he did so, a vision of his arch enemy rose before him.
The Homesteader|Oscar Micheaux
A golden eagle, the armorial ensign of the Ripperda family, crested the centre arch.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter
Bonaparte made his public entry into Milan under a triumphal arch.
The Every Day Book of History and Chronology|Joel Munsell
The girl, without saying a word, takes her by the cold hand, and leads her quickly down to the arch that opens on the hall.
Checkmate|Joseph Sheridan Le Fanu