The Collaborative International Dictionary of English v.0.48:
Urceolate \Ur"ce*o*late\, a. [L. urceolus, dim. of urceus a pitcher or waterpot.] (Nat. Hist.) Shaped like a pitcher or urn; swelling below, and contracted at the orifice, as a calyx or corolla. [1913 Webster]WordNet (r) 3.0 (2006):
urceolate adj 1: urn-shaped; large below and contracted toward the mouth