Macropinacoid :: Macropinacoid (n.) One of the two planes of an orthorhombic crystal which are parallel to the vertical and longer lateral (macrodiagonal) axes.
Macropod :: Macropod (n.) Any one of a group of maioid crabs remarkable for the length of their legs; -- called also spider crab.
Macropodal :: Macropodal (a.) Having long or large feet, or a long stem..
Macroprism :: Macroprism (n.) A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.
Macropteres :: Macropteres (n. pl.) A division of birds; the Longipennes.