1. Pithecanthropus former genus of primitive apelike men now Homo erectus
  2. Tocantins a river in eastern Brazil that flows generally north to the Para River
  3. cytogenetics the branch of biology that studies the cellular aspects of heredity (especially the chromosomes)
  4. St. Ignatius bishop of Antioch who was martyred under the Roman Emperor Trajan (died 110)
  5. pathogenesis the origination and development of a disease
  6. Contopus pewees
  7. Rhincodon typus large spotted shark of warm surface waters worldwide
  8. tidytips California annual having flower heads with yellow rays tipped with white
  9. chaetognathous of or relating to arrowworms
  10. Tautoga onitis large dark-colored food fish of the Atlantic coast of North America
  11. opisthognathous having receding jaws
  12. second base the base that must be touched second by a base runner in baseball
  13. take notice observe with special attention
  14. mitochondrion an organelle containing enzymes responsible for producing energy
  15. body count a count of troops killed in an operation or time period
  16. Pellaea ornithopus cliff brake of California and Baja California having purple-brown leafstalks
  17. cytogeneticist a geneticist who specializes in the cellular components associated with heredity
  18. cytokinetic of or relating to the division of the cytoplasm of a cell following the division of the nucleus
  19. Saint Ignatius bishop of Antioch who was martyred under the Roman Emperor Trajan (died 110)
  20. black-and-blue discolored by coagulation of blood beneath the skin