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Based on the details in the following passage, what is the meaning of the word parapet? "When her lover turned and looked at her, and his eye met hers as she sat there paler and whiter than any one in the vast ocean of anxious faces about her, he saw that she knew behind which door crouched the tiger and behind which stood the lady. Her right arm lay on the cushioned parapet before her."
What is a low railing around the royal box seats?