A large and complex service (economic activity).

A massive store, warehouse, or distribution center, especially one with a plain or unattractive exterior. / An extremely large watershed.

plural of megashed

plural of megasmash

plural of megasample

In a megascopic manner.

plural of megasatellite

(genetics) A large DNA tandem repeat

(geology, archaeology) A very large sequence of strata

plural of megasequence