sudiform,a.rare.|ˈs(j)uːdɪfɔːm| [f. L. sudis stake, pile + -form.] Shaped like a stake. 1822J. Parkinson Outl. Oryctol. 120 Their [sc. the sea-urchins'] spines are various, never uniformly setous, but either large and sudiform and as if truncated, or long and crenulated.