GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       
Vasodilator (?), a. [L. vas a vessel + dilator.] (Physiol.) Causing dilation or relaxation of the blood vessels; as, “the vasodilator nerves, stimulation of which causes dilation of the blood vessels to which they go”. These nerves are also called vaso-inhibitory, and vasohypotonic nerves, since their stimulation causes relaxation and rest.

    [1913 Webster]

    
      
    
  2.       
Vasodilator (?), n. [L. vas a vessel + dilator.] (Medicine & Physiology) A substance which causes dilation of blood vessels.

    [PJC]

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