You know what it looks like… but what is it called?
TAKE THE QUIZ“hoosac”
The following 2 entries include the term hoosac.
Hoosac Mountains
geographical namemountain range in northwestern Massachusetts and southwestern Vermont, a southern extension of the Green Mountains
Hoosac Tunnel
geographical namerailroad tunnel through the Hoosac Mountains in western Massachusetts 4.75 miles (7.6 kilometers) long; opened in 1875 after 24 years of work
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Merriam-Webster unabridged