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tetrahydric

tetrahydric, a. Chem.
  (tɛtrəˈhaɪdrɪk)
  [f. tetra- + hydric.]
  Applied to an alcohol containing four hydroxyl groups, e.g. erythrite, C4H6(OH)4.

1888 Morley & Muir Watts' Dict. Chem. I. 101 Erythrite is the only fatty tetra-hydric alcohol known.

Oxford English Dictionary

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