Tomy/tom—cutting, operation/incision

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Across
  1. 4. the science dealing with the structure of animals and plants.
  2. 5. division into three parts, classes, categories, etc.
  3. 6. the operation of excising or removing one or both tonsils.
  4. 7. the operation of cutting into a lobe, as of the brain or the lung.
  5. 8. a machine for making an x-ray of a selected plane of the body.
Down
  1. 1. the act or practice of opening a vein for letting or drawing blood as a therapeutic or diagnostic measure; venesection; bleeding.
  2. 2. excision of the vermiform appendix.
  3. 3. division into two parts, kinds, etc.; subdivision into halves or pairs.