Sentence:  The throng shouted, female Eligor flung flowers from the roofs as the rhythmic chiming of iron-shod riding beasts came clearer, and the first of the mighty array swung into view in the broad, <WSD>atrous</WSD> streets that curved round the spired Grand Union of Imperial Opal. 
Meaning of the word marked with <WSD> tags:  jet-black in color.