| 单词 | u |
| 释义 | U nnoun.substancea base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine Synset:U uracil Substance Holonyms:RNA ribonucleic acid Hypernyms:base nucleotide Inherited Hypernyms:uracilnucleotideesterorganic compoundcompoundchemicalmaterialsubstancematterphysical entityentity Inherited Hypernyms:uracilnucleotideesterorganic compoundcompoundchemicalmaterialsubstancepartrelationabstractionentity nnoun.substancea heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons Synset:U atomic number 92 uranium Substance Holonyms:pitchblende uraninite Hypernyms:metal metallic element Inherited Hypernyms:uraniummetallic elementchemical elementsubstancematterphysical entityentity Inherited Hypernyms:uraniummetallic elementchemical elementsubstancepartrelationabstractionentity Direct Hyponyms:uranium 235uranium 238 Full Hyponyms: uranium 235uranium 238 nnoun.communicationthe 21st letter of the Roman alphabet Synset:U Member Holonyms:Latin alphabet Roman alphabet Hypernyms:alphabetic character letter letter of the alphabet Inherited Hypernyms:ulettercharacterwritten symbolsymbolsignalcommunicationabstractionentity adj satadj.all(chiefly British) of or appropriate to the upper classes especially in language use Region:BritainGreat BritainU.K.UKUnited KingdomUnited Kingdom of Great Britain and Northern Ireland Antonyms:lower-classmiddle-class Inherited Hypernyms:u Similar to:upper-class |
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