(creationism, pseudoscience) The discredited theory that the speed of light has decreased over time, proposed by creationists in order to support the belief that the universe is a few thousand years old even though there are objects visible today that are billions of light years away (whereas a constant speed of light would indicate that the universe is billions of years old and so contradict this belief).

(physics) A nuclear reaction in which a beta particle (electron or positron) is emitted.

(physics) A chained series of the products of nuclear decay of a particular isotope

(physics) Radioactive decay by emitting an alpha particle.

plural of decay chain

(physics) Any of several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more smaller nuclei.

(biochemistry) A cellular pathway for the rapid destruction of damaged or mutant messenger RNAs lacking a stop codon in the proper reading frame.

(biochemistry) A cellular pathway for the rapid destruction of messenger RNAs with premature stop codons resulting from nonsense mutations or frameshifts.