|pe.trə|grafik, -fēk adjective
or pet·ro·graph·i·cal -fə̇kəl, -fēk-
Etymology: petrographic probably from (assumed) New Latin petrographicus, from New Latin petrographia petrography + Latin -icus -ic; petrographical from New Latin petrographia + English -ical
: of or relating to petrography
• pet·ro·graph·i·cal·ly -fə̇k(ə)lē, -fēk-, -li adverb