If you're working with Windows and come across a word you don't know, you can easily look it up in the macOS Dictionary. Just hover the mouse cursor over the word and either press Control-Command-D or tap (don't click) the touchpad with three fingers.
Notes: 1. Parallels Tools must be installed in Windows. 2. When you hover the mouse over a word, the mouse cursor should change from arrow to text selection. This functionality does not support translating words contained in images.