n.
Pronunciation: ' ma-kr ō - ˌ str ə k-ch ə r
Function: noun
Date: circa 1899
: the structure (as of metal, a body part, or the soil) revealed by visual examination with little or no magnification
– mac · ro · struc · tur · al \ ˌ ma-kr ō - ' str ə k-ch ə -r ə l, - ' str ə k-sh ə -r ə l \ adjective