The Collaborative International Dictionary of English v.0.48:

Valvular \Valv"u*lar\, a. [Cf. F. valvulaire.]
   [1913 Webster]
   1. Of or pertaining to a valve or valves; specifically
      (Med.), of or pertaining to the valves of the heart; as,
      valvular disease.
      [1913 Webster]

   2. Containing valves; serving as a valve; opening by valves;
      valvate; as, a valvular capsule.
      [1913 Webster]

WordNet (r) 3.0 (2006):

valvular
    adj 1: relating to or operating by means of valves