نجب

نَجَبٌ ذ The bark (لِحَاآء) of trees: (S, K:) or the rind of the roots thereof: or of what is hard thereof. (K.) The soft peel of branches is not thus called; nor is the rind of roots called قِشْر, but نجب: n. un. نَجَبَةٌ. (TA.)