Sentence:  The blue sky is glossy and fat with heat, a few thin <WSD>cirri</WSD> sheared to blown strands like hair at the rims. 
Meaning of the word marked with <WSD> tags:  A principal high-level cloud type characterised by white, delicate filaments or wisps, of white (or mostly white) patches, or of narrow bands, found at an altitude of above 7000 metres.