1. air cell a tiny sac for holding air in the lungs
  2. arcella an amoeba-like protozoan with a chitinous shell resembling an umbrella
  3. urocele extravasation of urine into the scrotal sac
  4. hair cell a sensory epithelial cell present in the organ of Corti
  5. air well a shaft for ventilation
  6. aerosol a cloud of solid or liquid particles in a gas
  7. arousal a state of heightened physiological activity
  8. uracil a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
  9. urceole a vessel that holds water for washing the hands
  10. Ercilla a genus of evergreen climbers
  11. jail cell a room where a prisoner is kept
  12. air-cool equip with an apparatus for controlling the humidity and temperature
  13. Purcell English organist at Westminster Abbey and composer of many theatrical pieces (1659-1695)
  14. irascible quickly aroused to anger
  15. varicella acute viral disease that causes skin eruptions and fever
  16. parcel a wrapped package
  17. fiercely in a physically fierce manner
  18. Kerr cell optical device consisting of a transparent cell with two electrodes between two polarizing media; passes light only if the two planes of polarization are parallel; used as a high-speed shutter or to modulate a laser beam
  19. hair seal any of several seals lacking external ear flaps and having a stiff hairlike coat with hind limbs reduced to swimming flippers
  20. egg cell the female reproductive cell; the female gamete