mega·dri·li \ˌ ̷ ̷ ̷ ̷ˈdrīˌlī\noun plural Usage: capitalized Etymology: New Latin, from mega- + -drili (from Greek drilos earthworm) in some classifications: a group of Oligochaeta comprising relatively large predominantly terrestrial worms that have a capillary network on the nephridium and being nearly coextensive with Neoligochaeta — compare microdrili