#gonad  a gland in which gametes (sex cells) are produced
  supertype:  #endocrine_gland__endocrinegland__ductless_gland  any of the glands of the endocrine system that secrete hormones directly into the bloodstream
  subtype:  #ovary  one of usually two organs that produce ova and (in vertebrates) secrete estrogen and progesterone
  subtype:  #ovotestis__ovotesti  hermaphroditic gonad that contains both testicular and ovarian tissue
  subtype:  #testis__testicle__orchis__ball__ballock__bollock__nut  one of the two male reproductive glands that produce spermatozoa and secrete androgens; "she kicked him in the balls and got away"
     subtype:  #undescended_testis__undescended_testicle__undescendedtesticle  a testis that fails to move into the scrotum as the male fetus develops; "undescended testicles have an increased risk for cancer"

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