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单词 uracil
释义

WordReference Random House Unabridged Dictionary of American English © 2024
u•ra•cil  (yŏŏr′ə sil),USA pronunciation n. 
  1. Biochemistrya pyrimidine base, C4H4N2O2, that is one of the fundamental components of RNA, in which it forms base pairs with adenine. Symbol: U
  • ur-1 + ac(etic) + -il, of uncertain origin, originally 1905–10

Collins Concise English Dictionary © HarperCollins Publishers::
uracil /ˈjʊərəsɪl/ n
  1. a pyrimidine present in all living cells, usually in a combined form, as in RNA. Formula: C4H4N2O2
Etymology: 20th Century: from uro-1 + acetic + -ile
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更新时间：2025/7/23 16:37:59