Definition of erumpent
1
: tending to grow out vigorously from a substrate so as to burst through or rise above its surface
- certain erumpent fungi that parasitize leaves
2
of the fruiting bodies of some fungi and algae
: grown or burst through a surface (as of a host's tissue) so as to form a projecting mass
- the erumpent fruiting bodies of some rusts
- erumpent acervuli forming black dots on the leaves
