Exam: TOEFL

Definition: A three-dimensional shape that has eight flat surfaces, known as faces.

Example: The architect designed a building in the shape of an octahedron.

Definition: Relating to or occurring every eight days.

Example: The octan schedule for the meetings was set to repeat every eight days.

Definition: A type of hydrocarbon found in petroleum, commonly used as a fuel in engines.

Example: Higher octane fuel can improve engine performance and efficiency.

Definition: A type of alcohol that has eight carbon atoms in its structure, commonly used in the production of fragrances and other chemical products.

Example: Octanol is often used in the manufacture of perfumes and flavorings.

Definition: A type of protein made up of eight linked amino acids.

Example: The scientist studied the effects of the octapeptide on cell growth.

Definition: A type of government or organization that is led or controlled by eight individuals or groups.

Example: The octarchy was formed to ensure equal representation among the eight member states.

Definition: A set of eight lines in poetry or a series of eight items. It can also refer to a specific period in ecclesiastical contexts.

Example: The poem begins with an octave that sets the tone for the rest of the piece.

Definition: A group or set of eight items, often used in contexts like music or science.

Example: The orchestra performed a beautiful octet composed for eight instruments.

Definition: Referring to a person who is between 80 and 90 years old.

Example: My grandmother is an octogenarian who still enjoys gardening.

Definition: A person who is between 80 and 90 years old.

Example: My grandmother is an octogenarian who still enjoys gardening.

Definition: Referring to an organism that has eight sets of chromosomes in its cells.

Example: The octoploid plant species can thrive in various environments due to its genetic diversity.

Definition: An organism that has eight sets of chromosomes, which is more than the usual two sets found in most species.

Example: The octoploid plant species can produce larger fruits than its diploid relatives.