English to English Dictionary

Ornithology

The scientific study of birds, including their physiology, behavior, and conservation.

Ornithophobia

An irrational fear of birds.

Ornithorhynchus

A genus of egg-laying mammals that includes the platypus, characterized by a duck-bill and webbed feet.

Orogeny

The process of natural mountain formation, especially by the upward folding of the earth's crust.

Orphrey

An ornamental band or border, especially one made of gold or silver thread, used in ecclesiastical vestments.

Orrery

A clockwork mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons.

Orris

The dried rhizome of the iris plant, used in perfumery and cosmetics.

Orthodontics

The branch of dentistry concerned with the prevention and correction of irregularities of the teeth.

Orthodontist

A dentist who is specially trained to diagnose, prevent, and treat dental and facial irregularities, particularly by using braces and aligners.

Orthodox

Following or conforming to traditional or generally accepted rules or beliefs, especially in religion.

Orthodox Medicine

A system of medicine that is based on established scientific principles and practices, often contrasted with alternative or complementary medicine.

Orthograph

The conventional spelling system of a language.