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[mass noun] A complex organic polymer deposited in the cell walls of many plants, making them rigid and woody.
- ‘Callose, lignin and suberin are polymers that can be elicited as plant defences that reinforce cell walls of some species.’
- ‘The hypodermis of all three species has two distinct zones that contain suberin and lignin.’
- ‘Cytochemistry and autofluorescence observations were used to detect the presence of lignin and suberin in unfixed tissues.’
- ‘While animal cell membranes decay too rapidly to be pyritised, the cellulose or lignin cell walls of plants are more resistant and may be preserved in this way.’
- ‘Impregnation of endodermal and hypodermal walls with suberin and lignin should reduce the diameter of interfibrillar spaces.’
Early 19th century: from ligni- ‘of wood’+ -in.
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