Final answer:
The term denoting rejectability related to crystalline structures is 'Defect'. Defects, such as vacancies, interstitial defects, and impurities, can greatly affect a material's properties, leading to rejectability especially in applications that require specific structural or conductive properties.
Step-by-step explanation:
The term denoting rejectability from the provided choices is d) Defect. In the context of crystallography and materials science, defects within crystals are departures from the perfect orderly arrangement of atoms. There are several types of crystal defects such as vacancies, which are positions that should contain atoms or ions but are vacant; interstitial defects, wherein atoms or ions occupy spaces between regular lattice positions; and impurities, where foreign atoms or ions are incorporated into the crystal, often deliberately in a process known as doping to modify properties of the material. Defects can significantly alter the physical and chemical properties of materials, potentially leading to rejectability for certain applications, especially if they affect the structural integrity or conductive properties required for specific uses like semiconductors or computer chips.