Definitions

1. noun

A large pore, especially one in the exoskeleton of an insect, such as a beetle.

“The entomologist examined the beetle’s exoskeleton, noting the presence of a megalopore.”

2. noun

In a fossil, a large pore or opening, especially one that leads to a chamber or passageway.

“The paleontologist studied the megalopore in the ammonite fossil to understand its internal structure.”