excurrent

Adjective

1. Of a vein or costa, extending beyond the tip or the margin of a leaf.
   • This species of tree is recognized by the excurrent veins in its leaves.
2. Carrying outward; permitting outward flow.
   • The excurrent apertures (called oscula because they look like little mouths) project their thin cone-shaped lips into the water stream passing over a sponge. - 2001, Julian Sprung, Invertebrates: A Quick Reference...