Standard Lemma 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.
Sound
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
name
Initialism of Russian Federation.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, initialism
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Initialism of right foot.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, countable, initialism, uncountable
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Initialism of rangefinder.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, countable, initialism, uncountable
Topics: arts, hobbies, lifestyle, photography
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Initialism of radio frequency.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, countable, initialism, uncountable
Topics: business, electrical-engineering, electricity, electromagnetism, electronics, energy, engineering, natural-sciences, physical-sciences, physics
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Initialism of rheumatoid factor.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, countable, initialism, uncountable
Topics: medicine, pathology, sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Initialism of ratfuck (“dirty rick or act of sabotage or interference”).
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, countable, initialism, slang, uncountable
Topics: engineering, government, military, natural-sciences, physical-sciences, politics, war
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Initialism of right field or right fielder.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, countable, initialism, uncountable
Topics: ball-games, baseball, games, hobbies, lifestyle, sports
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Abbreviation of radiance field.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, countable, uncountable
Qualifier: imaging
Topics: arts, engineering, hobbies, lifestyle, natural-sciences, optics, photography, physical-sciences, physics
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
reconnaissance fighter; an unarmed fighter modified for photo-reconnaissance (prefix)
Definition source: English Wiktionary via Wiktextract
Usage: US
Topics: aeronautics, aerospace, aviation, business, engineering, government, military, natural-sciences, physical-sciences, politics, war
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
a complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: reticular formation
Antonyms: none provided
Broader terms: neural network, neural net
noun
a radioactive transuranic element which has been synthesized
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: rutherfordium, unnilquadium, Unq, element 104, atomic number 104
Antonyms: none provided
Broader terms: chemical element, element
noun
a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: releasing factor, releasing hormone
Antonyms: none provided
Broader terms: factor
Narrower terms: growth hormone-releasing factor, GHRF
History
Various etymologies.
Combination of prefix F and prefix modifier R
Across languages
5 source translations are retained for this English entry.
