allantoidal

from The Collaborative International Dictionary of English v.0.48

Allantoid \Al*lan"toid\, Allantoidal \Al`lan*toid"al\, a. [Gr. ?
   shaped like a sausage; ? sausage + e'i^dos form.] (Anat.)
   Of or pertaining to the allantois.
   [1913 Webster]