Definition: A theory in biology suggesting that the evolution of a species is mainly driven by internal factors rather than external influences like natural selection.

Example: The concept of orthogenesis proposes that species evolve in a predetermined direction over time.

Definition: Relating to a theory in biology that suggests species evolve in a straight line or in a predetermined direction, rather than through random variation.

Example: The concept of orthogenetic evolution challenges the idea of random mutations in species development.

Definition: A type of virus that has RNA as its genetic material and is known for causing influenza and other respiratory illnesses.

Example: The orthomyxovirus is responsible for seasonal flu outbreaks.

Definition: A type of salt or ester that comes from orthophosphoric acid, commonly found in fertilizers and other chemical compounds.

Example: Farmers often use orthophosphate in their fertilizers to promote plant growth.

Definition: A person who studies or collects insects from the order Orthoptera, which includes grasshoppers, crickets, and locusts.

Example: The orthopterist spent hours observing the behavior of crickets in their natural habitat.

Definition: Relating to a type of crystal structure that has three axes of different lengths that are all at right angles to each other.

Example: The mineral has an orthorhombic crystal structure, making it unique among its peers.

Definition: Relating to an optical instrument that produces a clear and accurate image without distortion.

Example: The orthoscopic lens provided a true representation of the scene without any visual distortion.

Definition: Describing a type of ovule that grows straight up, with the opening at the top opposite the stalk.

Example: The orthotropous ovule is positioned vertically, ensuring the micropyle is at the apex.

Definition: To move or swing back and forth in a regular rhythm or to vary between different states or opinions.

Example: The pendulum began to oscillate steadily after being released.

Definition: Moving back and forth in a regular pattern.

Example: The oscillating fan helped to cool the room evenly.

Definition: To move or swing back and forth in a regular rhythm.

Example: The pendulum is oscillating steadily from side to side.