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  1. orchid cactus any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers
  2. echinocactus any cactus of the genus Echinocactus
  3. Arctictis binturongs
  4. architecture the discipline dealing with the design of fine buildings
  5. orchidectomy surgical removal of one or both testicles
  6. architect someone who creates plans to be used in making something
  7. archduchess a wife or widow of an archduke or a princess of the former ruling house of Austria
  8. Orchidaceae enormous cosmopolitan family of perennial terrestrial or epiphytic plants with fleshy tubers or rootstocks and unusual flowers
  9. archidiaconate office or position of an archdeacon
  10. Orchidales order of plants with irregular flowers having minute seeds: Orchidaceae; Burmanniaceae
  11. architeuthis largest mollusk known about but never seen (to 60 feet long)
  12. Archidiskidon a genus of Elephantidae
  13. arctic moss an erect greyish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humans
  14. Archilochus a genus of Trochilidae
  15. Oryctolagus Old World rabbits
  16. orchidalgia pain in the testes
  17. crab cactus South American jointed cactus with usually red flowers
  18. orchitis inflammation of one or both testes
  19. Pediocactus low-growing cacti of the Great Plains of North America
  20. architectonics the science of architecture