ur·ce·o·late /ˌɝˈsiələt, ˈɚ/
  甕形的
  Ur·ce·o·late a.  Nat. Hist. Shaped like a pitcher or urn; swelling below, and contracted at the orifice, as a calyx or corolla.
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  urceolate
       adj : urn-shaped; large below and contracted toward the mouth