Definition of “arch” - English Dictionary

“arch” in British English

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archnoun [ C ]

uk /ɑːtʃ/ us /ɑːrtʃ/

arch noun [ C ] (CURVED STRUCTURE)

C2 a structure, consisting of a curved top on two supports, that holds the weight of something above it:

In many churches the side aisles are separated from the central aisle by a row of arches.
Passing through the arch, you enter an open courtyard.
The vines were trained over an arch, providing shade as well as fruit.
The temple's grand white arches rose conspicuously over the dirty decaying city.
The abbey is known for its majestic arches, fine doorways and elegant windows.
The town is dominated by the massive arches of a viaduct.
See also

arch noun [ C ] (BODY)

specialized medical any organ or part of the body that is curved in shape:

archverb [ I or T ]

uk /ɑːtʃ/ us /ɑːrtʃ/

archadjective

uk /ɑːtʃ/ us /ɑːrtʃ/

showing that you think it is amusing that you know more about something than someone else does:

an arch tone of voice
archly
adverb uk /ˈɑːtʃ.li/ us /ˈɑːrtʃ.li/

She smiled archly at him.
"I fail to understand what you're suggesting," said Claire archly.

arch-prefix

uk /ɑːtʃ-/ us /ɑːrtʃ-/

(Definition of “arch” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“arch” in American English

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archnoun [ C ]

us /ɑrtʃ/

a structure consisting of a curved top on two supports which holds the weight of something above it, or something decorative that has this shape:

Two rows of arches support the roof of the building.

The arch of your foot is the higher, curved part on the bottom.

arch
verb [ I/T ] us /ɑrtʃ/

[ T ] Cats often arch their backs when they stretch.
arched
adjective us /ɑrtʃt/

Arched bookcases filled each end of the room.

(Definition of “arch” from the Cambridge Academic Content Dictionary © Cambridge University Press)