Sentence:  <WSD>Orris</WSD> is the part of the florentine iris you don′t see — the rhizome....The ancient Egyptians and Greeks learned that the bland-smelling <WSD>orris</WSD> root would take on a remarkable fragrance if dried for at least two years. 
Meaning of the word marked with <WSD> tags:  The fragrant root of such an iris.