precursor
前体,前驱体,前身,前兆
Related Words
Definitions
- 1
- : a person or thing that precedes, as in a job, a method, etc.; predecessor.
- : a person, animal, or thing that goes before and indicates the approach of someone or something else; harbinger: The first robin is a precursor of spring.
- : Chemistry, Biochemistry. a chemical that is transformed into another compound, as in the course of a chemical reaction, and therefore precedes that compound in the synthetic pathway: Cholesterol is a precursor of testosterone.
- : Biology. a cell or tissue that gives rise to a variant, specialized, or more mature form.
Synonyms & Antonyms
Examples
Not only do they come from myriad sources—asphalt is a big one, but paints and other products also release the precursor compounds to pollutants—but the chemical reactions that create these secondary compounds are also complex.
Continuously monitoring these types of carbon dioxide emissions in the Apennines and other seismically active regions, such as California and Japan, could reveal whether uprising gas is a precursor or product of quakes, he says.
SAC is also working on ways to verify the self-reported data behind the scores, as a precursor to making some of the data public next year.
Monkeys’ greater difficulty learning recursive sequences, relative to people, fits a scenario in which “this ability is evolutionarily ancient and could have been a precursor to the development of human grammar,” Ferrigno says.
Preserving some of the stylized features of its heavy precursor, the lighter Chalcidian helmet was also imbued with practical design upgrades that allowed its wearer to have better hearing and relatively unimpeded vision.
That convention, though poorly attended, was the precursor to the Constitutional Convention.
Postol and Lloyd were skeptical; hexamine is a common precursor chemical for military-grade explosives.
It includes a quote from Ehud Olmert, the interim Prime Minister of Israel in 2003, as a precursor to gameplay.
The clearest precursor of this scenario was Helios Airways Flight 522 flying from Cyprus to Athens in August 2005.
Previous drugs targeting amyloid protein, or APP, have failed.