Yes, zero is playable
					...and is worth 13 points.
			
	
		
		
		
	
	Found in the following dictionaries
	Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Zero" Definition
        noun
        	
		A sight setting that enables a firearm to shoot on target.
		
	 
	
	    	
	
	    	
		Informal   Nothing; nil:  Today I accomplished zero.
		
	 
	
	    	
		Informal   One having no influence or importance; a nonentity:  a manager who was a total zero.
		
	 
	
	    	
		Mathematics   A cardinal number indicating the absence of any or all units under consideration.
		
	 
	
			    verb
        	
		To determine or adjust the zero of (as a rifle).
		
	 
	
	    	
		To concentrate firepower on the exact range of.
		
	 
	
	    	
		To adjust fire on a specific target.
		
	 
	
	    	
		To close in on or focus attention on an objective.
		
	 
	
			    adjective
        	
		Having no measurable or otherwise determinable value.
		
	 
	
	    	
		Informal   Absent, inoperative, or irrelevant in specified circumstances: "The town has . . . practically no opportunities for amusement, zero culture”  ( Robert M. Adams).
		
	 
	
	    	
		Linguistics   Of or relating to a morpheme that is expected by an established, regular paradigm but has no spoken or written form. Moose has a zero plural; that is, its plural is moose.
		
	 
	
	    	
		Meteorology   Designating a ceiling not more than 16 meters (52 feet) high.
		
	 
	
	    	
		Meteorology   Limited in horizontal visibility to no more than 55 meters (180 feet).
		
	 
	
			    verb-transitive
        	
		To adjust (an instrument or a device) to zero value.
		
	 
	
			    phrasal-verb
        	
		Zero in  To adjust the aim or sight of by repeated firings.
		
	 
	
	    	
		Zero in  To aim or concentrate firepower on an exact target location.
		
	 
	
	    	
		Zero in  To converge intently; close in:  The children zeroed in on the display of toys in the store window.
		
	 
	
	    	
		Zero out  To eliminate (a budget or budget item) by cutting off funding.
		
	 
	
	    	
		Zero out  To reduce to zero.
		
	 
	
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