Exam: TOEFL

Definition: The study and use of sound waves that are at frequencies higher than what humans can hear, often used in various technologies and medical applications.

Example: Ultrasonics is widely used in medical imaging to create images of the inside of the body.

Definition: A medical imaging method that uses high-frequency sound waves to create images of internal body structures or developing fetuses.

Example: The doctor recommended an ultrasonography to check the baby's development.

Definition: A medical technique that uses high-frequency sound waves to create images of the inside of the body, often used to check on the health of a developing baby or to examine organs.

Example: The doctor used an ultrasound to check the baby's heartbeat during the pregnancy.

Definition: The very small and detailed structure of a biological specimen, like a cell or tissue, that can only be seen with special tools like electron microscopes.

Example: Scientists studied the ultrastructure of the cell to understand its functions better.

Definition: Relating to a type of light that is not visible to the human eye and has shorter wavelengths than violet light.

Example: Ultraviolet light can cause sunburn and skin damage.

Definition: A type of light that is not visible to the human eye and has a shorter wavelength than visible light, often associated with sunburn and used in various technologies.

Example: Ultraviolet rays from the sun can cause skin damage if you are not protected.

Definition: To make a long, loud, mournful sound, often like a howl or wail, usually expressing strong emotion or grief.

Example: The mourners began to ululate as the procession passed by.

Definition: Relating to the navel or umbilical cord, often used to describe something that is central or connects to the abdomen.

Example: The doctor explained the importance of the umbilical cord during pregnancy.

Definition: A cord that connects a developing baby to its mother, providing nutrients and oxygen during pregnancy.

Example: The doctor explained how the umbilical cord is essential for the baby's growth before birth.

Definition: A small, navel-like indentation or dimple in the center of a rounded object.

Example: The fruit had a noticeable umbilication at its center, making it look unique.

Definition: A small depression or opening, often referred to as the navel in humans, and can also describe similar features in other organisms or objects.

Example: The doctor explained that the umbilicus is the scar left after the umbilical cord is cut at birth.

Definition: A dark area where all light is blocked, often seen in shadows or during an eclipse.

Example: During the solar eclipse, the moon created an umbra that covered the earth completely.