lignin defined in 1951 yearlignin - lignin;
lignin - Complex aromatic compound, chemistry of which is not fully understood (considered to be a polymer of phenyl propane units), which is deposited in cell walls of sclerenchyma, xylem vessels and tracheids, making them strong and rigid. Forms 25-30 per cent of the wood of trees.
near lignin in Knolik
definition of word "lignin" was readed 912 times