Definition: A type of organic compound that is important in biology, consisting of a benzene ring with two hydroxyl (OH) groups attached to it.

Example: Catechol is often used in chemical reactions and as a building block in organic synthesis.

Definition: A type of chemical that acts as a hormone or neurotransmitter in the body, including substances like epinephrine and dopamine, which are important for various physiological functions.

Example: Catecholamines are released during stress and help prepare the body for a 'fight or flight' response.

Definition: Relating to or based on categories; absolute and without exceptions.

Example: The manager made a categorical statement about the company's future plans.

Definition: The act of sorting or organizing items into different groups based on shared characteristics or qualities.

Example: The categorization of books in the library helps readers find what they are looking for more easily.

Definition: To place something into a specific group or class based on shared characteristics or qualities.

Example: Teachers often categorize students based on their learning styles.

Definition: A group or class that shares common characteristics or qualities, used to organize or categorize similar items or ideas.

Example: The library has a section for each category of books, including fiction, non-fiction, and reference.

Definition: A curve formed by a flexible cable or chain that is hanging freely between two points, shaped like a U or an inverted U.

Example: The bridge was designed with a catenary arch to distribute weight evenly.

Definition: The process of linking things together in a series or chain, especially in chemistry where atoms form bonds to create chains or rings.

Example: The catenation of carbon atoms allows for the formation of complex organic molecules.

Definition: A three-dimensional shape created by rotating a catenary curve around an axis.

Example: The catenoid is an important shape in architecture and engineering due to its structural properties.

Definition: A type of enzyme found in animal tissues that helps break down proteins into smaller pieces called polypeptides.

Example: Cathepsins play a crucial role in the digestion of proteins within cells.