Webster's English Dictionary

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naphthol

naph.thol \'naf-.tho.l, 'nap-, -.tho-l\ n [ISV] 1: either of two white 
   crystalline hydroxyl derivatives C10H7OH  of napththalene found in coal tar 
   or made synthetically and used as antiseptics and in manufacture of dyes 2: 
   any of various hydroxy derivatives containing the naphthalene nucleus