1. riding mower a power mower you can ride on
  2. heart murmur an abnormal sound of the heart
  3. radiomicrometer radiometer that is extremely sensitive
  4. Sir Thomas More English statesman who opposed Henry VIII's divorce from Catherine of Aragon and was imprisoned and beheaded; recalled for his concept of Utopia, the ideal state
  5. atomic number quantity of protons in the nucleus of an atom of an element
  6. red marrow bone marrow of children and some adult bones that is required for the formation of red blood cells
  7. bread maker someone who bakes bread or cake
  8. atomic mass the property of an atom that causes it to have weight
  9. road mender a workman who is employed to repair roads
  10. read-only memory (computer science) memory whose contents can be accessed and read but cannot be changed
  11. vade mecum a concise reference book providing specific information about a subject or location
  12. thread maker someone who spins (who twists fibers into threads)
  13. Tirich Mir a mountain in the Hindu Kush in Pakistan (25,230 feet high)
  14. Read method a method of natural childbirth that assumes it is a normal process and that the pain is largely psychological; involves education and breathing exercises to foster relaxation and other exercises
  15. read/write memory the most common computer memory which can be used by programs to perform necessary tasks while the computer is on; an integrated circuit memory chip allows information to be stored or accessed in any order and all storage locations are equally accessible
  16. ready-mix a commercial preparation containing most of the ingredients for a dish
  17. dead metaphor a metaphor that has occurred so often that it has become a new meaning of the expression (e.g., `he is a snake' may once have been a metaphor but after years of use it has died and become a new sense of the word `snake')
  18. disclaimer a voluntary repudiation of legal claim to something
  19. latecomer someone who arrives late
  20. rhythmically in a manner recurring with measured regularity