The 'Define this..' add-on provides a simple and easy way to get definitions of English words over laid on your web pages. It calls the 'Define this..' dictionary and displays succinct usage examples and definitions.
To use just highlight the word or phrase that you need to define, right click your selection and choose the "Define this.." option from the context menu.
To use just highlight the word or phrase that you need to define, right click your selection and choose the "Define this.." option from the context menu.