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Meaning of lithify

lith•i•fy

Pronunciation: (lith'u-fī"), [key]
— v., -fied, -fy•ing.
—v.t.
  1. to change (sediment) to stone or rock.
—v.i.
  1. to become lithified.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.