Meaning of PLOUGH in English

Plough, the BrE AmE British English , the Plow American English

a group of seven bright stars that can only be seen from the northern part of the world. They form part of the ↑ constellation (=group of stars) called Ursa Major, and in the US they are often called the Big Dipper.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.