noun
: a crystal system characterized by three equal lateral axes intersecting at angles of 60 degrees and a vertical axis of variable length at right angles (as in the hexagonal prism) — see crystal system illustration
noun
: a crystal system characterized by three equal lateral axes intersecting at angles of 60 degrees and a vertical axis of variable length at right angles (as in the hexagonal prism) — see crystal system illustration
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012