Verb
The word is derived from lignify
of Lignify
Source: Webster's dictionaryDuring the early Silurian, they developed specialized cells, which were lignified (or bore similar chemical compounds) to avoid implosion; this process coincided with cell death, allowing their innards to be emptied and water to be passed through them. Source: Internet
Banded tubes, as well as tubes with pitted ornamentation on their walls, were lignified citation and, when they form single celled conduits, are considered to be tracheids. Source: Internet
Exceptions include highly lignified cells, the sclerenchyma and xylem which are dead at maturity, and the phloem sieve tubes which lack nuclei. Source: Internet
Growing to height also employed another trait of tracheids – the support offered by their lignified walls. Source: Internet