Source : Webster's Revised Unabridged Dictionary (1913)

Valvule \Valv"ule\, n. [Cf. F. valvule.]
   1. A little valve; a valvelet.

   2. (Zo["o]l.) A small valvelike process.

Source : WordNet®

valvule
     n : a small valve (or valve-like structure) [syn: {valvelet}, {valvula}]