Definition of "lignification" [lig•ni•fi•ca•tion]

• Turning to wood; the process of becoming ligneous. (noun)

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• "It is still an open question whether the cellulose constituents of the lignocelluloses are progressively condensed -- with progress of 'lignification' -- to the unsaturated or lignone groups."
• "Then the root tips get tucked into the ground, a process that triggers so-called lignification in which the roots start to harden and grow thicker and thicker."
• "· Bamboos differ from grasses in the long life-span of the culms (hollow stalk), their branching and lignification (development of woody tissues)."