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Comprehensive
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androstenedione a steroid hormone precursor to testosterone and estrogen that is secreted by the testes, ovaries, and adrenal cortex.
bombard a primitive stone-throwing device, the precursor of the modern cannon. [1/4 definitions]
dehydroepiandrosterone a steroid hormone produced by the adrenal glands, gonads, and brain that is a precursor of androgens and estrogens.
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]
plasminogen the inactive precursor of plasmin, an enzyme in plasma that dissolves certain proteins involved in blood clotting.
progenitor an originator of or model for something; precursor. [1/2 definitions]
protoplanet a large body of matter that is a precursor to a planet.
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.
tryptophan an essential amino acid in animals that is a component of proteins and a precursor of serotonin and niacin.
tyrosine an amino acid found in proteins that is a precursor of certain hormones and neurotransmitters.
uracil a pyrimidine compound essential to life, important in metabolism and as a precursor of RNA.