Exam: TOEFL

Definition: A weight attached to a string or rod that swings back and forth, often used in clocks to keep time.

Example: The pendulum of the clock swung steadily, marking each passing second.

Definition: Able to be entered or passed through; something that can be broken into or accessed.

Example: The fortress had a penetrable wall that could be breached by attackers.

Definition: To enter or pass through something, often with force or effort.

Example: The sunlight began to penetrate the thick forest canopy.

Definition: To enter or pass through something, often in a way that allows influence or understanding; to affect deeply or to spread throughout.

Example: The sunlight began to penetrate the thick clouds, brightening the day.

Definition: Able to enter or pass through something; having a strong or sharp quality that can be felt or noticed.

Example: The penetrating sound of the siren could be heard from miles away.

Definition: In a way that is able to reach deeply into something or to understand something thoroughly.

Example: She looked at him penetratingly, as if trying to see into his soul.

Definition: The act of entering or piercing something, often used in contexts like military attacks, sexual intercourse, or gaining influence.

Example: The penetration of enemy lines was a significant achievement in the battle.

Definition: Having the ability to understand or notice things quickly and deeply; insightful.

Example: Her penetrative questions revealed the underlying issues in the discussion.

Definition: A type of amino acid that is used in medicine to treat certain conditions like cystinuria, rheumatoid arthritis, and metal poisoning.

Example: The doctor prescribed penicillamine to help manage the patient's condition.

Definition: A type of antibiotic that is used to treat infections caused by bacteria. It is derived from a mold and is effective against certain types of bacteria.

Example: The doctor prescribed penicillin to help fight the infection.

Definition: A type of enzyme made by some bacteria that breaks down penicillin, making it ineffective. This enzyme is important in medicine, especially for treating penicillin allergies.

Example: The doctor explained that the infection was resistant to treatment because the bacteria produced penicillinase.