fundiform UK /ˈfʌn.dɪ.fɔːm/US /ˈfʌn.dɪˌfɔɹm/ adjective1 •Resembling or arranged in the form of a sling; specifically designating the lower part of the inferior constrictor muscle of the pharynx (cricopharyngeal muscle), and the fibers of this part of the muscle.