The Collaborative International Dictionary of English v.0.48:

Corymbose \Co*rym"bose\ (k?-r?m"b?s or k?r"?m-b?s`), a. (Bot.)
   Consisting of corymbs, or resembling them in form. [Written
   also corymbous.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

corymbose
    adj 1: resembling a corymb