Is it magnum opus or magnus opus?

Magnum Opus (the great work).

It is a person's finest work of art or literature. It is like a life time achievement.

Not everyone will agree on what Emily Dickinson's greatest single work (magnum opus) is. Some of her most famous poems are: Hope is the Thing with Feathers Because I Could Not Stop For Death T'is So...

The creator and writer of this film is the motivational speaker Douglas Vermeeren. He is known as the achievement expert. He has interviewed more than 400 of the world's top achievers and teaches...

In the world of classical music, a composer would generally not go to a publisher with a single piece of music, unless it was a major composition like a symphony. Composers would write a suite of...