androstenedione

[ăn′drə-stēndī-ōn′, -dē-ōn′]
n.
  1. An unsaturated androgenic steroid existing in three isomeric forms that is secreted by the testis, ovary, and adrenal cortex and has a weaker biological potency than testosterone.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.