Exam: IELTS

Definition: A difficult responsibility or obligation that someone has to deal with.

Example: The onus is on the manager to ensure that the project is completed on time.

Definition: A protective structure where certain types of parasites develop and can be transferred to new hosts.

Example: The oocyst is essential for the life cycle of the parasite, allowing it to survive outside the host.

Definition: A type of cell that develops into an egg in females; it is involved in reproduction.

Example: The oocyte is crucial for the process of fertilization in many animals.

Definition: The process by which an egg cell is formed and matures in the female reproductive system.

Example: Oogenesis is essential for reproduction in many animals, including humans.

Definition: A person who studies or collects birds' eggs.

Example: The oologist carefully examined the eggs for signs of damage.

Definition: A medical procedure in which one or both ovaries are surgically removed from a woman's body.

Example: After the diagnosis, the doctor recommended an oophorectomy to prevent further health issues.

Definition: The quality of being difficult to see through or understand; lack of transparency.

Example: The opacity of the glass made it hard to see inside the room.

Definition: Showing a play of colors like an opal, often with a milky or shimmering appearance.

Example: The opalescent surface of the water reflected the colors of the sunset beautifully.

Definition: Not able to be seen through; not transparent or clear.

Example: The glass was opaque, making it impossible to see what was inside the box.

Definition: A substance that does not allow light to pass through, making it impossible to see through it.

Example: The artist used an opaque paint to create a rich, dark background for the painting.

Definition: In a way that is not transparent or clear; not allowing light to pass through.

Example: The glass was treated so that it could be seen only opaquely.