macrostructure

/M AE0 K R OW0 S T R AH1 K CH ER0/
noun
  1. 1

    The gross structure of a material or tissue as visible to the unaided eye or at very low levels of magnification.

  2. 2

    The gross structure of a pure metal or alloy, as revealed by magnifications of 10X or less.

Source: https://en.wiktionary.org/wiki/macrostructure