Sentence:  The cavities of the pleuræ and pericardium were filled with a reddish serous effusion; but these membranes, with the exception of numerous points of <WSD>purpurous</WSD> effusion beneath them, were otherwise quite healthy. The <WSD>purpurous</WSD> spots were seen both under the pleura pulmonalis and costalis. 
Meaning of the word marked with <WSD> tags:  Of or relating to purpura.