Sentence:  All the cells of the suspensor, except one, are eventually crushed and obliterated by the growing embryo; this fortunate cell known as the <WSD>hypophysis</WSD> is the one in immediate contact with the embryo and plays an important role in the formation of the root apex. 
Meaning of the word marked with <WSD> tags:  The top cell of the suspensor in a dicot embryo, which will differentiate to form part of the root cap.