Having a pallial sinus. See under Sinus.
In Molluscs, having a well-developed siphon, and so an indented pallial line; opp. integripalliate.
sin-[=u]-pal'i-[=a]t, adj. having a sinuous pallial margin on the shell along the line of attachment of the mantle.--Also SINUPALL'IAL. [L. sinus, a fold, pallium, a mantle.]