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  1. letter bomb a thin explosive device inside an envelope or package and detonated when opened
  2. cluster bomb bomb consisting of a canister that is dropped from a plane and that opens to release a cluster of bomblets (usually fragmentation bombs) over a wide area
  3. letter bond a bond that has not been registered with the Securities and Exchange Commission and cannot be sold to the general public
  4. letter box a numbered compartment in a post office where mail is put to be called for
  5. pattern-bomb bomb in certain patterns
  6. glide-bomb bomb by gliding
  7. petrol bomb a crude incendiary bomb made of a bottle filled with flammable liquid and fitted with a rag wick
  8. water pump the pump in the cooling system of an automobile that cause the water to circulate
  9. letterpress printing from a plate with raised characters
  10. neutron bomb atom bomb that produces lethal neutrons with less blast
  11. litterbug a person who leaves trash in public places
  12. letterman an athlete who has earned a letter in a school sport
  13. litterbin bin into which the public can put rubbish
  14. latter the second of two or the second mentioned of two
  15. letter paper writing paper for use in writing correspondence
  16. logic bomb a set of instructions inserted into a program that are designed to execute (or `explode') if a particular condition is satisfied; when exploded it may delete or corrupt data, or print a spurious message, or have other harmful effects
  17. dirty bomb an atom bomb that leaves considerable radioactive contamination
  18. letter opener dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books
  19. ytterbium a soft silvery metallic element
  20. atom bomb a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)