Sentence:  This aspect of astrology impinged on medicine too, since an <WSD>horary</WSD> question could be a request for diagnosis, in which case the doctor might answer it by inspecting not just the arrangement of the heavens but also a sample of the patient's urine, bearing in mind when it was passed or when it was brought to him. 
Meaning of the word marked with <WSD> tags:  Whose answer can be worked out by drawing up a horoscope of the exact time the question was asked.