(Greek, ismos; Latin, ismus: a suffix: belief in, practice of, condition of, process, characteristic behavior or manner, abnormal state, distinctive feature or trait)
2. A condition of being pleiotropic.
2. The phenomenon of different colors appearing when certain crystals are viewed from different directions.
3. An optical phenomenon where due to double refraction of light by a colored gem or crystal, the light is divided into two paths which are polarized at a 90° angle to each other.
As the divided light follows different paths within the stone and are traveling at different speeds, they may have the result of differential selective absorption; therefore, when they leave the crystal they have different colors, making the stone appear to be of multiple colors.
Some stones show two colors or shades and are called dichroic, some show three and are trichroic. Gems are sometimes cut and set either to display pleochroism or to hide it, depending on the colors and their potential attractiveness.
2. Close to or nearly the same shape.
2. A toxic condition produced by the absorption of excessive lead into the system.
3. A diseased condition, produced by the absorption of lead, common among workers in this metal or in its compounds, as among painters, typesetters, etc.
It is characterised by various symptoms; such as, lead colic, lead line, and wrist drop.
2. A community in which people of different religious beliefs and practices, or various races, etc. can live together and all them can continue to have their different interests, traditions, and social life styles: "There are some nations that still do not allow pluralism to exist."
2. Caring little; indifferent; nonchalant.