Sentence:  Virgins of equall birth, of equall years, / Whose vertues held with thine an emulous strife, / Shall draw thy picture, and record thy life; / One shall <WSD>ensphere</WSD> thine eyes, another shall / Impearl thy teeth; a third thy white and small / Hand shall besnow, a fourth, incarnadine / Thy rosie cheek, 
Meaning of the word marked with <WSD> tags:  To form into a sphere.