1. rostrum a platform raised above the surrounding level
  2. nostrum patent medicine whose efficacy is questionable
  3. mistral a strong north wind that blows in France during the winter
  4. midstream the middle of a stream
  5. mainstream the prevailing current of thought
  6. moratorium suspension of an ongoing activity
  7. mesoderm the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
  8. mousetrap a trap for catching mice
  9. mistreat treat badly
  10. mistrial a legal proceeding that is invalid or inconclusive
  11. pastrami a highly seasoned cut of smoked beef
  12. stream a natural body of water flowing on or under the earth
  13. mustard pungent powder or paste prepared from ground mustard seeds
  14. lustrum a ceremonial purification of the Roman population every five years following the census
  15. Cestrum genus of fragrant tropical American shrubs
  16. abstract existing only in the mind
  17. strum sound the strings of an instrument
  18. monotreme the most primitive mammals comprising the only extant members of the subclass Prototheria
  19. moisture wetness caused by water
  20. mastered understood perfectly