Uracil

Part of speech: noun

Pronunciation: /ˈjʊərəsɪl/

Definitions

1. A nitrogen-containing base crucial for RNA that replaces thymine found in DNA and pairs with adenine during protein synthesis
2. A pyrimidine that serves as a nitrogenous base in RNA, substituting thymine found in DNA and pairing with adenine to assist in protein synthesis
3. A chemical compound serving as a nitrogenous base found exclusively in RNA where it pairs with adenine instead of thymine

Etymology: Uracil was named in 1885 by the German chemist Robert Behrend, who was trying to make new compounds related to uric acid, the substance found in urine. Working on that family of molecules, he built a new one that he called after its origins: the name combines "uro-", from uric acid, with "ac" from "acetic" and the suffix "-ile", which chemists used for certain organic compounds. The result is a name that records its chemical lineage in its syllables rather than describing its shape or function. The compound turned out to matter far beyond Behrend's laboratory. It is one of the four nitrogen bases in RNA, where it pairs with adenine and takes the place that thymine occupies in DNA. The name therefore preserves the story of a chemist chasing derivatives of a waste product and ending up with a molecule central to genetic information.