Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
The limit on measurement accuracy at quantum scales due to back-action effects.
Definition source: English Wiktionary via Wiktextract
Qualifier: quantum mechanics
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
The shortest wavelength in an X-ray spectrum.
Definition source: English Wiktionary via Wiktextract
Qualifier: spectroscopy
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
The spectroscopic sense is first attested in the 1920s; the measurement sense was coined by Vladimir Braginsky in a 1967 paper, and was originally restricted to the study of gravitational waves.
