Exam: TOEFL

Definition: In a way that shows a selfless concern for the well-being of others, without expecting anything in return.

Example: She altruistically donated her time to help the less fortunate.

Definition: A type of chemical compound made of aluminum and oxygen, often found in nature as a mineral. It is used in making aluminum and in various products like ceramics and abrasives.

Example: Alumina is a key ingredient in the production of aluminum metal.

Definition: A lightweight, silvery-white metal that is used in many products, such as cans, foil, and airplane parts. It is known for being strong yet easy to shape.

Example: The airplane's body is made of aluminium to reduce weight and improve fuel efficiency.

Definition: A type of mineral that contains both aluminum and silicon, often found in rocks and used in various industrial applications.

Example: Aluminosilicate minerals are important in the formation of clay and other geological materials.

Definition: This word describes something that is connected to or includes aluminum or alum, which are types of chemical elements or compounds.

Example: The aluminous minerals are essential for the production of aluminum.

Definition: A lightweight, silvery-white metal that is soft and can be easily shaped. It is a good conductor of electricity and heat, and it does not rust easily. This metal is commonly used in many products, including cans, foil, and airplane parts.

Example: The airplane's body is made of aluminum to reduce weight and improve fuel efficiency.

Definition: A woman who has graduated from or previously attended a school, college, or university.

Example: She is an alumna of Harvard University.

Definition: A man who has completed his studies at a school, college, or university, or someone who has previously attended a particular educational institution.

Example: He is an alumnus of Harvard University.

Definition: This word describes something that is connected to small air sacs in the lungs, the part of the jaw that holds teeth, or sounds made with the tongue near the gums.

Example: The alveolar ridge is crucial for proper articulation of certain speech sounds.

Definition: A sound made by placing the tongue against the ridge behind the upper front teeth.

Example: The English language has several alveolar sounds, such as 't' and 'd'.

Definition: A small, hollow space in the body, such as in the lungs where air is exchanged, or in the jawbone where teeth are held.

Example: The alveolus is essential for gas exchange in the respiratory system.