資料來源 : Webster's Revised Unabridged Dictionary (1913)

Petiolule \Pet"i*o*lule\, n. [Cf. F. p['e]tiolule.] (Bot.)
   A small petiole, or the petiole of a leaflet.

資料來源 : WordNet®

petiolule
     n : the stalk of a leaflet