1. introitus entrance or opening to a hollow organ or tube
  2. android an automaton that resembles a human being
  3. anatropous completely inverted; turned back 180 degrees on its stalk
  4. underdress dress without sufficient warmth
  5. introduce bring something new to an environment
  6. underpass an underground tunnel or passage enabling pedestrians to cross a road or railway
  7. androgenous of or related to androgenesis
  8. androgynous having both male and female characteristics
  9. anthropoid ape any tailless ape of the families Pongidae and Hylobatidae
  10. Andreaeales comprises a single genus: Andreaea
  11. intrados the interior curve of an arch
  12. adroitness skillful performance or ability without difficulty
  13. Indriidae a family of Lemuroidea
  14. Windward Isles a group of islands in the southeastern West Indies
  15. Andricus cynipid gall wasps, chiefly affecting oaks
  16. Windward Passage a channel between eastern Cuba and western Haiti that connects the Atlantic Ocean with the Caribbean Sea
  17. Enterobius pinworms
  18. androglossia a woman's voice with male qualities
  19. enteritis inflammation of the intestine
  20. underboss an assistant or second-in-command to a chief

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