Definition: A person trained to travel and work in space, specifically in the Russian or Soviet space program.

Example: The cosmonaut floated gracefully in the weightlessness of space.

Definition: The universe seen as a well-organized and harmonious system, including all matter, energy, and space.

Example: Astronomers study the cosmos to understand the origins and structure of the universe.

Definition: A part of a plant or insect that looks like a rib, such as the main vein in a leaf or the front vein in an insect's wing.

Example: The costa of the leaf is essential for its structure and support.

Definition: Related to the ribs in the body.

Example: The costal cartilage connects the ribs to the sternum.

Definition: In a manner related to the coast or shoreline.

Example: The beach was costally developed to enhance tourism.

Definition: Describing something that has ribs or rib-like structures.

Example: The costate leaves of the plant give it a unique texture.

Definition: A mathematical function that represents the ratio of the length of the adjacent side to the length of the opposite side in a right-angled triangle.

Example: In trigonometry, the cotan of an angle is used to find the ratio of the adjacent side to the opposite side.

Definition: A mathematical function that represents the ratio of the length of the adjacent side to the length of the opposite side in a right triangle, or the cosine of an angle divided by its sine.

Example: In trigonometry, the cotangent of a 45-degree angle is equal to 1.

Definition: Describing a situation where high or low tides happen at the same time in different places.

Example: The cotidal lines on the map show where the tides are synchronized.

Definition: A substance produced in the body when nicotine is broken down, often used to measure how much nicotine a person has consumed.

Example: The doctor tested my blood for cotinine to see if I had been smoking recently.