Sentence:  Thus passed away two <WSD>lustra</WSD> of her life, and, as yet, my daughter remained nameless upon the earth. "My child," and "my love," were the designations usually prompted by a father's affection, and the rigid seclusion of her days precluded all other intercourse. Morella's name died with her at her death. Of the mother I had never spoken to the daughter;—it was impossible to speak. 
Meaning of the word marked with <WSD> tags:  A period of five years.