A person who or (esp.) a thing which is unobservable.
| 单词 | θ65403 | 
| 释义 | the world > physical sensation > sight and vision > invisibility > 			[noun]		 > state of not being noticeable > things (1)		 unobservable1851 A person who or (esp.) a thing which is unobservable.  | 
	
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