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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
Ribbon stage
The stage when whisked eggs and sugar form a pale, thick foam that falls from the whisk in a trail which briefly remains visible on the surface.
Ribosome
A cell structure where amino acids are joined together to make proteins.
Ribosome
A small sub-cellular structure where proteins are made.
RICE
An initial injury-care method using rest, ice, compression and elevation to help relieve pain and swelling.
Rice paper
A paper-like material made from the rice-paper plant and associated with Eastern Asia.
Richter scale
A logarithmic earthquake magnitude scale based on recorded ground-motion amplitude, with corrections for distance. A one-unit increase represents a tenfold increase in amplitude.
Rickets
A condition in children in which developing bones become soft and weak, commonly associated with insufficient vitamin D or calcium.
Rifling
Spiral grooves inside a gun barrel that make the projectile spin, improving its accuracy.
Rift valley
A long depression formed where the crust is pulled apart and a block of land sinks between faults.
Right
An entitlement that a person can claim, such as the right of an eligible citizen to vote.
Right Action
An element of the Noble Eightfold Path concerned with ethical behaviour, including avoiding harm and stealing.
Right angle
An angle measuring exactly . It is conventionally marked by a small square at the vertex.
Right-angled triangle
A triangle containing one angle of exactly .
Righteous
Morally right and just. Christians describe God as righteous because his character and judgements are good and fair.
Righteous anger
Anger directed at injustice or wrongdoing rather than personal revenge. In Christianity, it can express a desire to restore justice in accordance with God’s will.
Righteousness
Living rightly in relation to God and God’s will. Jesus contrasts ‘the righteous’ with ‘sinners’ when explaining whom he has come to call.
Right-hand grip rule
A rule for finding the magnetic-field direction around a current-carrying wire: point the right thumb in the direction of conventional current, and the curled fingers show the field direction.
Right-hand grip rule
A method for finding the magnetic field direction around a wire: point the right thumb along the conventional current, and the curled fingers show the field direction.
Right-hand thumb rule
A method for finding the magnetic field direction around a straight wire: point your right thumb along the conventional current, and your curled fingers show the field direction.
Right intention
The requirement that war should aim to establish justice and lasting peace, not satisfy hatred, greed or revenge.
Rightist
A political label used by Mao’s government for people accused of opposing socialism and wanting to restore capitalism; it did not necessarily describe their actual beliefs.
Right Livelihood
An aspect of the Buddhist Eightfold Path requiring people to earn a living without causing harm.
Right of abode
The legal right to live in the UK and enter it without immigration restrictions.
Right of appeal
The right of a convicted person to challenge a verdict through the appropriate legal procedure.
Right prism
A solid with the same polygon-shaped cross-section throughout its length, with its length perpendicular to that cross-section.
Rights
Recognised freedoms, protections or entitlements, such as freedom of worship or the right to vote.
Right side
The surface of a fabric intended to face outwards in the finished product.
Right to Buy
The policy introduced by the Housing Act of 1980 that allowed council tenants to purchase their homes.
Right to return
The Palestinian refugees’ claim that they should be allowed to return to the homes and land they had left before or during the 1948–49 war.
Right to withdraw
A participant’s freedom to refuse or stop taking part in research without pressure or penalty.
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