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U
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
The 21st letter of the Roman alphabet
Classified under:
Nouns denoting communicative processes and contents
Hypernyms ("U" is a kind of...):
alphabetic character; letter; letter of the alphabet (the conventional characters of the alphabet used to represent speech)
Holonyms ("U" is a member of...):
Latin alphabet; Roman alphabet (the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe)
Sense 2
Meaning:
A heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
Synonyms:
Classified under:
Hypernyms ("U" is a kind of...):
metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)
Hyponyms (each of the following is a kind of "U"):
uranium 235 (a uranium isotope with mass number 235; capable of sustaining chain reactions)
uranium 238 (the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239)
Holonyms ("U" is a substance of...):
pitchblende; uraninite (a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore)
Sense 3
Meaning:
A base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
Synonyms:
U; uracil
Classified under:
Nouns denoting substances
Hypernyms ("U" is a kind of...):
base; nucleotide (a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA))
Holonyms ("U" is a substance of...):
ribonucleic acid; RNA ((biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell)
II. (adjective)
Sense 1
Meaning:
(chiefly British) of or appropriate to the upper classes especially in language use
Classified under:
Similar:
upper-class (occupying the highest socioeconomic position in a society)
Domain region:
Britain; Great Britain; U.K.; UK; United Kingdom; United Kingdom of Great Britain and Northern Ireland (a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; 'Great Britain' is often used loosely to refer to the United Kingdom)
Context examples:
A U.S. federal health insurance program for people aged 65 years or older and people with certain disabilities.
(Medicare, NCI Dictionary)
U.S. researchers said this week they have discovered a way to genetically engineer corn, the world's largest commodity crop, to produce a type of amino acid found in meat.
(US Researchers Genetically Modify Corn to Boost Nutritional Value, VOA News)
The U.S. Food and Drug Administration urges careful consideration before using any pain-relieving medication during pregnancy.
(Acetaminophen exposure in pregnancy linked to higher risk of ADHD, autism, National Institutes of Health)
Now, in a study of mice, a team of Japanese and U.S. researchers show that it may also be a time when the brain actively forgets.
(The brain may actively forget during dream sleep, National Institutes of Health)
These practices, especially in the form of Traditional Chinese Medicine have a prominent position in the U.S.
(Acupuncture and Oriental Medicine, NCI Thesaurus)
Some parents adopt children from the U.S, and some adopt from abroad.
(Adoption, NIH)
U.S. production of chlordane was stopped in 1976.
(Chlordane, NCI Thesaurus)
The Centers for Disease Control and Prevention is part of the U.S. Public Health Service of the Department of Health and Human Services (DHHS).
(Centers for Disease Control and Prevention, NCI Dictionary)
A form required for certification of compliance under 42 U.S.C. Section 282(j)(5)(B) with Requirements of ClinicalTrials.gov Data Bank.
(Certification of Compliance: FDA Form 3674, Food and Drug Administration)
Polio used to be a cause of paralysis, but polio no longer occurs in the U.S.
(Paralysis, NIH)
