1. Notonectidae aquatic carnivorous insects
  2. endangered in imminent threat of extinction
  3. Nicene Creed a formal creed summarizing Christian beliefs
  4. downgrade the property possessed by a slope or surface that descends
  5. tankard large drinking vessel with one handle
  6. Nadine Gordimer South African novelist and short-story writer whose work describes the effects of apartheid (born in 1923)
  7. descending aorta the descending part of the aorta that branches into the thoracic and abdominal aortae
  8. connecting rod a rod that transmits motion
  9. write in code convert ordinary language into code
  10. denigrate attack the good name and reputation of someone
  11. cantankerous stubbornly obstructive and unwilling to cooperate
  12. Montenegro a former country bordering on the Adriatic Sea
  13. white snakeroot American herb having flat-topped clusters of small white flower heads; reputedly a cause of trembles and milk sickness; sometimes placed in genus Eupatorium
  14. voting right the right to vote
  15. Stalingrad a city in the European part of Russia on the Volga
  16. ascending aorta the ascending part of the aorta as it emerges from the left ventricle
  17. mountain gorilla gorilla of Kivu highlands
  18. sounding board a person whose reactions to something serve as an indication of its acceptability
  19. concord a harmonious state of things and of their properties
  20. Tonocard antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed

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