Exam: Cambridge English: C1 Advanced (CAE)

Definition: Having a shape that consists of two pyramids joined at their bases.

Example: The crystal had a bipyramidal shape, making it look unique among the other stones.

Definition: A type of molecule that has two parts, each with an unpaired electron, making it reactive.

Example: The chemist studied the properties of a biradical to understand its reactivity.

Definition: The phenomenon where light is split into two different rays when it passes through certain materials that have different properties in different directions.

Example: Birefringence can be observed in crystals like calcite, where light behaves differently depending on the direction it travels.

Definition: Relating to a property of certain materials that have different refractive indices for light polarized in different directions, causing double refraction.

Example: The birefringent crystal split the light into two beams, creating a beautiful effect.

Definition: Describing a system or device that can exist in two different stable conditions or states.

Example: The bistable circuit can switch between on and off states without losing its memory.

Definition: A device that can hold two stable states, often used in electronics to store binary information.

Example: The bistable circuit can switch between two states without needing continuous power.

Definition: A long and thin surgical knife used for making small cuts in the skin or other tissues during medical procedures.

Example: The surgeon used a bistoury to make precise incisions during the operation.

Definition: A chemical compound that is a salt derived from sulfuric acid, containing the bisulfate ion (HSO4).

Example: The bisulfate solution is commonly used in various chemical reactions.

Definition: A chemical compound that contains the bisulfite ion, which is derived from sulfurous acid and has the formula HSO3.

Example: The bisulfite solution is often used in food preservation.

Definition: Relating to or containing a type of black, sticky substance that is used in making roads and roofing materials.

Example: The construction company used bituminous materials for the new road.

Definition: Referring to a relationship or correspondence between two sets where each element in one set is paired with exactly one element in the other set, and vice versa.

Example: In mathematics, a biunique function ensures that each input corresponds to a unique output and each output corresponds to a unique input.