libriform adjective 1noun 1forms 2 adjective1 •Resembling or having the form of liber, or bast.The unseptate fibres, the true libriform cells, are only sparingly pitted, except in a few species like Oleander, where they are pitted on both the radial and tangential walls — 1885 noun1 •Tissue composed of cells of this kind. formsmore libriform · most libriform