Sentence:  Serene, smiling, enigmatic, she faced him with no fear whatever showing in her dark eyes....She put back a truant curl from her forehead where it had sought egress to the world, and looked him full in the face now, drawing a deep breath which caused the <WSD>round</WSD> of her bosom to lift the lace at her throat. 
Meaning of the word marked with <WSD> tags:  A circular or spherical object or part of an object.