Sentence:  The water in Thor 's big swimming pool had been covered with a blanket of thick , foamy soapsuds - fashioned , of course , from ZING - Joyce had dived from the <WSD>board</WSD> into the pool , then swirled and cavorted in her luxurious `` bath '' while cameras rolled . 
Meaning of the word marked with <WSD> tags:  a flat piece of material designed for a special purpose