| 单词 | rib cloud | 
| 释义 | > as lemmasrib cloud   rib cloud  n. rare a cloud formation resembling ribs. ΚΠ 1868    G. M. Hopkins Jrnls. & Papers 		(1959)	 170  				At sunset featherbed sky with a fluffy and jointed rib-cloud. 2009    docweather.com 16 Feb. 		(O.E.D. Archive)	  				When it gets to a cooler area the moisture in the rising current precipitates out as ice crystals. This forms the rib cloud form. < as lemmas | 
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