Definition of Sigmaidal	
	    			    		
		    		{ Sig"moid (?), Sig*moid"al (?), }
a. [Gr. &?;&?;&?;; &?;&?;&?; sigma + &?;&?;&?; form,
likeness: cf. F. sigmoïde.] Curved in two directions,
like the letter S, or the Greek &sigmat;. 
Sigmoid flexure (Anat.), the last
curve of the colon before it terminates in the rectum. See
Illust. under Digestive. -- Sigmoid
valves. (Anat.) See Semilunar valves,
under Semilunar.
{ Sig"moid (?), Sig*moid"al (?), }
a. [Gr. &?;&?;&?;; &?;&?;&?; sigma + &?;&?;&?; form,
likeness: cf. F. sigmoïde.] Curved in two directions,
like the letter S, or the Greek &sigmat;. 
Sigmoid flexure (Anat.), the last
curve of the colon before it terminates in the rectum. See
Illust. under Digestive. -- Sigmoid
valves. (Anat.) See Semilunar valves,
under Semilunar.
  
		    		 - Webster's Unabridged Dictionary (1913) 
		    		 
		    		    			
	    			 
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