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  1. altruism the quality of unselfish concern for the welfare of others
  2. ecotourism tourism to exotic or threatened ecosystems to observe wildlife or to help preserve nature
  3. vector sum a vector that is the sum of two or more other vectors
  4. Yggdrasil (Norse mythology) a huge ash tree whose roots and branches hold the earth and Heaven and Hell together
  5. acrosome a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg
  6. catharsis purging the body to stimulate evacuation of the bowels
  7. Ygdrasil (Norse mythology) a huge ash tree whose roots and branches hold the earth and Heaven and Hell together
  8. actress a female actor
  9. androecium a male gametoecium
  10. ecoterrorism violence carried out to further the political or social objectives of the environmentalists
  11. Avogadro's number the number of molecules in a mole of a substance
  12. Avogadro's law the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules
  13. amateurism the conviction that people should participate in sports as a hobby (for the fun of it) rather than for money
  14. asterism (astronomy) a cluster of stars (or a small constellation)
  15. eggdrop soup made by stirring beaten eggs into a simmering broth
  16. Catharism a Christian movement considered to be a medieval descendant of Manichaeism in southern France in the 12th and 13th centuries; characterized by dualism (asserted the coexistence of two mutually opposed principles, one good and one evil); was exterminated for heresy during the Inquisition
  17. Avogadro number the number of molecules in a mole of a substance
  18. yacht race a race between crews of people in yachts
  19. Geoglossum type genus of the Geoglossaceae comprising the earthtongues
  20. dorsum the back of the body of a vertebrate or any analogous surface (as the upper or outer surface of an organ or appendage or part)