Definition: A planet that orbits a star outside of our solar system.

Example: Astronomers have discovered several new exoplanets in recent years.

Definition: Relating to the beginning or introduction of something.

Example: The exordial section of the speech set the tone for the entire presentation.

Definition: Relating to the hard outer structure that supports and protects certain animals, like insects and crustaceans.

Example: The crab has an exoskeletal structure that helps it survive in its environment.

Definition: A hard outer covering that protects or supports an animal, like the shell of an insect or crustacean.

Example: The crab's exoskeleton helps protect it from predators.

Definition: The movement of gases, vapors, or liquids through membranes or porous materials from the inside to the outside, which is the opposite of endosmose.

Example: Exosmose occurs when water vapor passes through the cell membrane into the air.

Definition: The outermost layer of the atmosphere surrounding the Earth or another planet, where the air is very thin and merges into space.

Example: The satellites orbit in the exosphere, far above the clouds and weather.

Definition: Relating to the outermost layer of a planet's atmosphere, where the atmosphere gradually fades into space.

Example: The satellite operates in the exospheric region of the Earth's atmosphere.

Definition: The outer layer of a spore found in certain types of algae and fungi, which protects the spore.

Example: The exospore helps to protect the spore from environmental conditions until it is ready to germinate.

Definition: A bony growth that forms on the surface of a bone or tooth.

Example: The doctor explained that the exostosis on his knee was not harmful.

Definition: Relating to a process that releases heat to its surroundings, often during a chemical reaction.

Example: The exothermal reaction caused the temperature of the surrounding area to rise significantly.