Sentence:  Some traditions of this <WSD>antiquer</WSD> system may have passed into Van Eyck's method, from distemper into oil, and thence downwards, gradually more vague, into the modern process, till they at length disappeared altogether about Rubens's time. 
Meaning of the word marked with <WSD> tags:  Belonging to former times, not modern, out of date, old-fashioned.