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tribromo-

tribrom-, tribromo- Chem.
  (traɪˈbrəʊm(əʊ)
  [f. tri- 5 c + bromo-.]
  A formative signifying that three atoms of bromine are substituted for hydrogen in the substance designated by the rest of the name; e.g. tribromobenzene: see tri- 5 c.

1852 Anderson in Q. Jrnl. Chem. Soc. IV. 117 The yellow precipitate thus obtained is the hydrobromate of tribromocodeine. 1900 Smith Richter's Org. Chem. II. 92 Aniline, acted upon by..bromine, yields..Tribromaniline.

Oxford English Dictionary

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