American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
I noticed that some small branches of the Persian walnuts had been injured, and particularly where grafts had started a little late and had not lignified quite thoroughly I lost whatever grafts had not had time to lignify.— Northern Nut Growers Association, Report of the Proceedings at the Third Annual Meeting Lancaster, Pennsylvania, December 18 and 19, 1912
Late summer grafting is not practical because the scions which make a start do not lignify their new shoots sufficiently to withstand the winter cold.— Northern Nut Growers Association Report of the Proceedings at the Eleventh Annual Meeting Washington, D. C. October 7 and 8, 1920
If plants which do not lignify for winter manage to direct successful wound repair after grafting and if plants which do lignify for winter do not conduct successful repair of grafted new growth it occurred to me in a speculative way that the reason might perhaps be sought in the nature of the two different kinds of hormones or of enzymes belonging to annuals and to perennials respectively.— Northern Nut Growers Association Report of the Proceedings at the Twenty-Fourth Annual Meeting Downington, Pennsylvania, September 11 and 12, 1933
Southern limitation of hickories which have a very short growing period, like the shagbark, may be due to the fact that after a period of summer rest, new growth begins in the autumn rains, and this new growth may not lignify for winter rest.— Northern Nut Growers Association Report of the Proceedings at the Second Annual Meeting Ithaca, New York, December 14 and 15, 1911
In the north where the warm season is not long enough to allow the autumn sprout to lignify sufficiently for bearing the rigors of winter it is killed.— Northern Nut Growers Association, Report of the Proceedings at the Seventh Annual Meeting Washington, D. C. September 8 and 9, 1916.

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