precursor
71precursor — n. 1 a a forerunner. b a person who precedes in office etc. 2 a harbinger. 3 a substance from which another is formed by decay or chemical reaction etc. Etymology: L praecursor f. praecurrere praecurs (as PRAE , currere run) …
72precursor chemical — Compounds that are required in the synthetic or extraction processes of drug production, and become incorporated into the drug molecule. Not used in the production of cocaine or heroin …
73precursor sweeping — The sweeping of an area by relatively safe means in order to reduce the risk to mine countermeasures vessels in subsequent operations …
74precursor tip — noun a) The reduced upper leaf zone found on many monocotyledons that usually takes the form of a cylindrical extension at the apex of the leaf. b) Any thickened or glandular leaf tip that is distinguishable from the rest of the laminas surface.… …
75precursor RNA — any of the unprocessed RNA primary transcripts in the eukaryotic nucleus; see pre mRNA, pre rRNA, and pre tRNA …
76Precursor of Dutch Painting — Lucas van Leyden …
77Precursor of Expressionism — Edvard Munch …
78Precursor of Japanese Art — Kose no Kanaoka …
79Precursor of Pharmacology — Paracelsus …
80Precursor of Pictorial Realism — Mathias Grunewald (Mathis der Mahler) …