macrocryst in English dictionary macrocryst Meanings and definitions of "macrocryst" (mineralogy) A relatively large crystal occurring in a mineral deposit, usually defined as one between 0.5 mm and 10 mm in size. noun (mineralogy) A relatively large crystal occurring in a mineral deposit, usually defined as one between 0.5 mm and 10 mm in size. more Grammar and declension of macrocryst macrocryst ( plural macrocrysts) macrocryst (plural macrocrysts) more Sample sentences with "macrocryst" Declension Stem Try again Available translations French Authors