the GNU version of the Collaborative International Dictionary of English
adj. Having the form of a funnel, or tunnel; that is, expanding gradually from the bottom upward, as the corolla of some flowers; infundibuliform.
The Century Dictionary and Cyclopedia
Having the form of a funnel, or inverted hollow cone; specifically, in botany, applied to a monopetalous corolla shaped like a funnel, in which the tube enlarges gradually from below, but expands widely at the summit; infundibuliform.
Word Usage
"Calyx inferior, funnelform, with 4-5 sepals as long as the corolla."