The Collaborative International Dictionary of English v.0.48:

Bursiform \Bur"si*form\, a. [LL. bursa purse + -form.]
   Shaped like a purse.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bursiform
    adj 1: shaped like a pouch [syn: bursiform, pouch-shaped,
           pouchlike, saclike]