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Glossary Item Description
Opioid Antagonists

Opioid antagonists are morphine-like substances which can be used to block the effect of endorphins in the central nervous system.

Oppositional Defiant Disorder

Oppositional defiant disorder (ODD) is a condtion where children have disruptive and oppositional behaviour that is particularly directed towards authority figures, such as parents or teachers.

Optimal Cell Support Glyconutrients

Optimal cell support glyconutrients is another term for glyconutrients, a form of monosaccharide sugars.

Options Method or Program

The Options Method or Program is sometimes used as another name for the Son-Rise Program, although it is actually a different programme run by the same company.


Orap is a brand name for pimozide, a conventional antipsychotic used to treat motor or verbal tics caused by Tourette's disorder.


Oregano is a herb which is sometimes used as an antifungal treatment.


Organotherapy is another name for stem cell therapies, in which processed tissue from animal embryos, foetuses or organs, is injected or taken orally.


Orodispersible refers to tablets which dissolve in the mouth and are therefore relatively easy to swallow.

Orthodox Medicine

Orthodox medicine is another term for standard health care, the medicine practiced by doctors and by allied health professionals (such as nurses, occupational therapists etc) which is based on sound scientific evidence.

Orthomolecular Therapy

Orthomolecular therapy is another term for the use of vitamins and minerals as a therapeutic tool.


Other specified feeding or eating disorder (OSFED) is a condition when your symptoms don't exactly match those of anorexia, bulimia or binge eating disorder, but it doesn't mean it's a less serious illness.


Osteopathy is a system of diagnosis and treatment for a wide range of medical conditions.


OT is an acronym for occupational therapy, an intervention designed to enable people to participate in daily activities as independently and satisfactorily as possible, using meaningful activities as a means to do this.

Other Behavioural Interventions

Other behavioural interventions is a term we use to define any behavioural interventions that we have yet to classify properly.

Other Dietary Supplements

We use the term other dietary supplements to refer to supplements other than vitamins and minerals.

Other Interventions

Other interventions is a term we use to define any interventions that we have yet to classify within this glossary.

Other Medications

We use the term other medications to describe any medications which don't fit into other categories in this glossary.


The outcome is the effect or impact of an intervention (treatment or therapy) on the participants.

Outcome Measures

Outcome measures are designed to measure the results of an action or intervention, such as a treatment or therapy.

Outdoor Adventure Programme

Outdoor Adventure Programmes sometimes involve residential or journey wilderness-based experiences in which students participate in one or more adventurous challenges and outdoor activities such as hiking, climbing, canoeing, ropes courses and group games.

About This Glossary

This glossary is designed to explain some of the jargon and gobbledygook used by some people when they talk about autism or research..

You may be able to find more information, including links to other parts of this website, by clicking on the title of an item.

If you can't find the word you are looking for, or you know of a word we should include, please email info@researchautism.net


The fact that an intervention is listed in this glossary does not necessarily mean that we agree with its use. Nor does it necessarily mean that there is any scientifically valid or reliable evidence behind it.