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Browse key terms and definitions across all GCSE subjects. Search by keyword or filter by subject and exam board.
23,110 key terms
Diabetes
A condition in which problems with insulin cause blood glucose concentration to become too high.
Diadem
A band worn around the head as a sign of royal status.
Diadem
An ornamental band worn around the head.
Diagnosis
Identifying an illness by examining a patient’s symptoms and other evidence.
Diagnosis
The process of identifying a disease or its cause from symptoms and tests.
Diagnosis
The identification of a disease or its cause using observations and, where needed, tests.
Diagnosis
Identifying a condition by assessing a person's symptoms against agreed criteria.
Diagnostic criteria
The symptoms and other requirements used to decide whether a person has a particular condition.
Diagnostic test
A test on a plant sample used to help identify the pathogen responsible for disease.
Diagonal
A line segment joining two non-adjacent vertices of a polygon.
Dialect
A variety of language associated with a region or social group, including distinctive vocabulary and grammar.
Dialect
A variety of language associated with a region or social group, which may have distinctive grammar and vocabulary as well as pronunciation.
Dialogue
Written conversation between characters, through which a writer can reveal personality, relationships and conflict.
Dialogue
Speech between characters, which can reveal their attitudes, feelings and relationships.
Dialogue
Listening and talking across differences to develop understanding and find common ground, rather than simply trying to win an argument.
Dialogue tag
Words identifying who speaks and sometimes how they speak, such as ‘she whispered’.
Dialysis
Treatment that removes waste from the blood when the kidneys cannot do so adequately.
Dialysis
A repeated treatment in which a machine removes waste substances and excess water and ions from a patient's blood.
Dialysis fluid
A fluid with carefully controlled concentrations that exchanges substances with the blood during dialysis.
Diameter
The distance across a circle through its centre; it is twice the radius.
Diameter
The distance from one side of an object to the other through its centre.
Diameter
A line segment through the centre of a circle with both endpoints on the circumference; its length is twice the radius.
Diameter
The distance across a circle through its centre; it is twice the radius.
Diamond
A form of carbon in which each atom bonds to four others in a giant three-dimensional covalent network.
Diana
The virgin goddess of hunting and the woods, to whom Camilla is dedicated as an infant.
Diaphragm
A thin surface that vibrates when pressure variations in a sound wave reach it.
Diaphragm
A dome-shaped muscle beneath the lungs that contracts and flattens during inhalation and relaxes during exhalation.
Diarrhoea
Frequent passing of loose or watery faeces.
Diaspora
People from a country who live abroad, together with communities of their descendants.
Diaspora
The spread of a people beyond their ancestral homeland, including later generations who retain connections to it.
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