Definition: A gray-brown mixture that is mainly made of certain antibiotics, used on the skin to treat infections caused by specific types of bacteria.

Example: The doctor prescribed tyrothricin to help heal the skin infection.

Definition: Existing or being present everywhere at the same time.

Example: Smartphones have become ubiquitous in modern society, found in the hands of people from all walks of life.

Definition: Relating to the study of unidentified flying objects (UFOs) and the phenomena associated with them.

Example: Many scientists are skeptical about ufological claims, but some find the subject fascinating.

Definition: A person who studies unidentified flying objects (UFOs) and investigates reports of sightings.

Example: The ufologist presented his findings at the annual conference on extraterrestrial life.

Definition: The study of objects in the sky that cannot be identified, often related to extraterrestrial life.

Example: Many researchers dedicate their careers to ufology, exploring the mysteries of unidentified flying objects.

Definition: A natural black substance that is used to make coatings that are resistant to acid, alkali, and water.

Example: Uintaite is often used in the production of waterproof coatings for various materials.

Definition: A sore or lesion that forms on the skin or inside the body, often causing pain and sometimes producing pus.

Example: The doctor diagnosed her with a stomach ulcer after she complained of severe abdominal pain.

Definition: Relating to or causing the formation of ulcers, which are painful sores on the skin or mucous membranes.

Example: The doctor diagnosed her with an ulcerative condition that required immediate treatment.

Definition: Describing something that can cause or lead to the formation of an ulcer in the body.

Example: Certain medications can be ulcerogenic if taken for a long time without food.

Definition: A soft, white mineral made of sodium, calcium, and boron, often found in loose, fibrous forms.

Example: Ulexite is sometimes called 'TV rock' because it can transmit images through its fibers.