Definition of Gateway Arch in English:

Gateway Arch

Syllabification: Gate·way Arch
A colossal arch built along the west bank of the Mississippi River in St. Louis, Missouri. The stainless steel arch, 630 feet (192 m) wide and rising 630 feet (192 m) above the banks of the river, was designed by Eero Saarinen and was built 1963–65.

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal