A centrosome with astral rays in the cytoplasm of an inseminated ovum; it is brought in by the penetrating spermatozoon and gives rise to the mitotic spindle of the first-cleavage division.

Nearby words

  1. sperm cell,
  2. sperm oil,
  3. sperm washing,
  4. sperm whale,
  5. sperm-,
  6. sperma-,
  7. spermaceti,
  8. spermacytic seminoma,
  9. spermagonium,
  10. spermary

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.