Precursor or Precursors may refer to: *

Precursor (religion) In religion, a precursor, also known as forerunner, predecessor, harbinger or herald, is a holy person who announced the approaching appearance of a central figure of the religion or who identified a central figure of the religion during the latter ...

, a forerunner, predecessor ** The Precursor, John the Baptist

Science and technology

* Precursor (bird), a hypothesized genus of fossil birds that was composed of fossilized parts of unrelated animals *

Precursor (chemistry) In chemistry, a precursor is a compound that participates in a chemical reaction that produces another compound. In biochemistry, the term "precursor" often refers more specifically to a chemical compound preceding another in a metabolic pathway, ...

, a compound that participates in the chemical reaction that produces another compound * Precursor (physics), a phenomenon of wave propagation in dispersive media * Precursor in the

course Course may refer to: Directions or navigation * Course (navigation), the path of travel * Course (orienteering), a series of control points visited by orienteers during a competition, marked with red/white flags in the terrain, and corresponding ...

of a disease, a state preceding a particular stage in that course *

Precursor cell In cell biology, a precursor cell, also called a blast cell or simply blast, is a partially differentiated cell, usually referred to as a unipotent cell that has lost most of its stem cell properties. A precursor cell is also known as a proge ...

(biology), a unipotent stem cell *

Earthquake precursor Earthquake prediction is a branch of the science of seismology concerned with the specification of the time, location, and magnitude of future earthquakes within stated limits, and particularly "the determination of parameters for the ''next'' s ...

, a diagnostic phenomenon that can occur before an earthquake * Gehrlein Precursor, a glider *

LNWR Precursor Class (disambiguation) The London and North Western Railway (LNWR) had three classes of steam locomotive identified as Precursor Class: * LNWR Webb Precursor Class of 1874–1879 by Francis Webb, a 2-4-0 * LNWR Whale Precursor Class The London and North Western Rai ...

, classes of passenger locomotives developed for the London and