I. combining form
or meg-
Etymology: Greek, from megas large, great, strong — more at much
1.
a. : great : large
mega bacterium
mega spore
: powerful
mega scope
: of the major order
mega diastrophism
mega mutation
: enlarged
mega type
or abnormally enlarged
mega duodenum
mega esophagus
b. : having a (specified) part of large size
mega dont
mega gnathous
c. : capable of being distinguished or identified without the aid of the microscope
mega breccia
mega fossil
mega phenocryst
2. : a million of : multiplied by one million
meg ohm
mega lumen
meg ampere
II. combining form
1. : greatly surpassing others of its kind
mega hero
mega polluters
2. : to a superlative degree
mega- successful