noun
orthorhombic crystal system
Technical term in geology and crystallography for a crystal system with three unequal axes at right angles.
直方晶系に属する鉱物には、トパーズやアラゴナイトがある。
Minerals belonging to the orthorhombic crystal system include topaz and aragonite.
Compound of 直方 (orthorhombic) + 晶系 (crystal system). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.