Source : Webster's Revised Unabridged Dictionary (1913)

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

Allantois \Al*lan"to*is\, Allantoid \Al*lan"toid\, ] n.. (Anat.)
   A membranous appendage of the embryos of mammals, birds, and
   reptiles, -- in mammals serving to connect the fetus with the
   parent; the urinary vesicle.

Source : WordNet®

allantoid
     adj : shaped like a sausage [syn: {sausage-shaped}]