Exam: Cambridge English: C2 Proficiency (CPE)

Definition: A yellow mineral made of arsenic trisulfide, often used as a pigment in art and decoration.

Example: The artist chose orpiment for its vibrant yellow color in the painting.

Definition: A person who studies or specializes in the correct pronunciation of words.

Example: The orthoepist helped the students improve their pronunciation in English class.

Definition: Relating to the correct way of spelling words in a language.

Example: The teacher emphasized the importance of orthographical accuracy in writing.

Definition: Relating to a type of crystal structure that has three axes of different lengths that are all at right angles to each other.

Example: The mineral has an orthorhombic crystal structure, making it unique among its peers.

Definition: Describing something that is intermediate in characteristics between two similar groups or closely adhering to something else.

Example: The osculant species displayed traits of both parent species, making it a unique subject of study.

Definition: A mouth-like opening in a sponge that is used to expel water.

Example: The osculum of the sponge allowed water to flow out, helping it to filter nutrients.

Definition: A unit used to measure the amount of a substance that affects the movement of water across a membrane in a solution.

Example: The doctor ordered a solution with a specific number of osmoles to ensure proper hydration for the patient.

Definition: A type of ancient fish that lived a long time ago, known for having a body covered in bony plates and lacking jaws.

Example: Scientists discovered fossils of an ostracoderm in the sediment layers of the ancient seabed.

Definition: A piece of pottery that has writing on it, often used in ancient times for voting or recording information.

Example: The archaeologists discovered an ostracon with ancient Greek inscriptions.

Definition: A piece of pottery or stone used in ancient times, often for writing or voting.

Example: In ancient Greece, citizens would write names on an ostrakon to vote for banishment.