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| 1. | Zoology. the occurrence of three forms distinct in structure, coloration, etc., among animals of the same species. |
| 2. | Botany. the occurrence of three different forms of flowers, leaves, etc., on the same plant or on distinct plants of the same species. |
| 3. | Crystallography. the property of some substances of crystallizing in three structurally distinct forms. |
| 4. | the property or condition of occurring in three distinct forms. |