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bombard a primitive stone-throwing device, the precursor of the modern cannon. [1/4 definitions]
forerun to be the precursor of; foreshadow. [1/2 definitions]
forerunner one that came before; ancestor; predecessor; precursor. [1/2 definitions]
oogonium a cell that is a precursor of an oocyte. [1/2 definitions]
progenitor an originator of or model for something; precursor. [1/2 definitions]
rhythm-and-blues a kind of popular American music, developed mostly by blacks, that combines blues and jazz, is characterized by a strong beat, and was a precursor of rock-'n'-roll.
uracil a pyrimidine compound essential to life, important in metabolism and as a precursor of RNA.