[flawr-uh-zin, flor-, fluh-rahy-zin]
noun Chemistry.
  1. a bitter, crystalline glucoside, C21H24O10, obtained from the root bark of the apple, pear, cherry, etc.: formerly used as a tonic and in the treatment of malaria; now used chiefly in biochemical research.
Also phlo·rid·zin [fluh-rid-zin] /fləˈrɪd zɪn/, phlo·rhi·zin, phlor·rhi·zin.

Origin of phlorizin

1830–40; < Greek phló(os) bark (variant of phloiós) + rhíz(a) root1 + -in2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018