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antigenic shift
The process by which different strains of a virus or viruses combine to form a new subtype having a mixture of the surface antigens of the original strains.
stick shifts
plural of stick shift
infield shifts
plural of infield shift
shift dress
A loose fitting dress that falls between midthigh and the knee.
semantic shift
(linguistics) A change in one of the meanings of a word over time.
gear shifts
plural of gear shift
Lamb shifts
plural of Lamb shift
hot shifts
red shift
(astronomy) Light spectra shifted towards red, as by elongation of light waves from a source moving away from the detector.
Lamb shift
(quantum mechanics, quantum electrodynamics) A small difference between the energy levels 2S_½ and 2P_½ of the hydrogen atom, not predicted by the Dirac equation, whose detection in the Lamb–Retherford experiment of 1947 foreshadowed the development of quantum electrodynamics (in which the discrepancy is explained to be an effect of the emission and re-absorption of virtual photons); such a difference between otherwise expectedly equal energy levels of hydrogen or any other type of atom.
