Sentence Examples


  • I would insist the father be nothing but a sperm donor.
  • Sperm sacs generally occupying a good many segments and with simple interior undivided by a network of trabeculae.
  • Spermatheca or receptacle of the sperm in copulation, opening into the female duct.
  • Sperm ducts traverse several segments on their way to exterior.
  • Weismann has also ingeniously argued from the structure of the egg-cell and sperm-cell, and from the way in which, and the period at which, they are derived in the course of the growth of the embryo from the egg - from the fertilized egg-cell - that it is impossible (it would be better to say highly improbable) that an alteration in parental structure could produce any exactly representative change in the substance of the germ or sperm-cells.