Definition of arches in English:

arches

Syllabification: arch·es
Pronunciation: /ˈärCHəz
 
/

noun

[treated as singular]
Used in names of moths with curving archlike patterns on the wings, such as dark arches.
  • Several genera in the families Noctuidae and Notodontidae

Definition of arches in:

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Word of the day ween
Pronunciation: wēn
verb
be of the opinion; think or suppose