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ornament
A decorative item used to beautify.
ornamental
Decorative, not functional.
ornamentation
decorative features added to something.
ornate
Highly decorated or elaborate.
orphan
A child whose parents are dead.
orphanage
A home for children without parents.
ORS
Oral rehydration salts for treating dehydration.
ortho
Prefix meaning straight or correct.
orthodoxy
Traditional beliefs or accepted doctrines.
orthogonal
At right angles; not related.
orthography
The conventional spelling system of a language.
orthopedic
Related to the correction of bones.
Orwellian
Relating to a strict and oppressive society.
Osage
A Native American tribe from the central United States.
osc
a device that creates regular repeating signals
Osceola
A famous Seminole leader in history.
oscillate
move back and forth in a regular rhythm.
oscillation
Swinging back and forth in a regular rhythm.
oscillator
a tool that creates a repeating electrical signal
OSHA
Occupational Safety and Health Administration.
OshKosh
A brand known for children's clothing.
osmosis
diffusion of water through a membrane
oso
Spanish word for bear; often used in names.
osprey
A large bird that catches fish.