Webster's English Dictionary

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hydroxyl

hy.drox.yl \hi--'dra:k-s*l\ \.hi--.dra:k-'sil-ik\ n [hydr- + ox- + -yl] : 
   the univalent group or radical OH consisting of one atom of hydrogen and  
   one of oxygen that is characteristic esp. of hydroxides, oxygen acids, 
   alcohols, glycols, and phenols - hy.drox.yl.ic aj