1. Arundo richardii tall grass of New Zealand grown for plumelike flower heads
  2. anterograde of amnesia; affecting time immediately following trauma
  3. as required according to need
  4. undergird make secure underneath
  5. undergrad a university student who has not yet received a first degree
  6. Easter card a card expressing an Easter greeting
  7. ascending aorta the ascending part of the aorta as it emerges from the left ventricle
  8. undergrowth the brush beneath taller trees in a wood or forest
  9. intriguer a person who devises plots or intrigues
  10. fond regard a feeling of affection for a person or an institution
  11. untracked lacking pathways
  12. undercurrent a feeling or tendency that is not explicitly expressed
  13. anti-torque rotor rotor consisting of a rotating airfoil on the tail of a single-rotor helicopter; keeps the helicopter from spinning in the direction opposite to the rotation of the main rotor
  14. sound recording a recording of acoustic signals
  15. off the record not for quotation
  16. mesenteric artery one of two branches of the aorta that pass between the two layers of the mesentery to the intestines
  17. Osmunda regalis large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds
  18. unconquered not conquered
  19. winter currant a flowering shrub
  20. ascending artery the branch of the ileocolic artery that supplies the ascending colon