Source : Webster's Revised Unabridged Dictionary (1913)

Libriform \Li"bri*form\ (l[imac]"br[i^]*f[^o]rm), a. [Liber +
   -form.] (Bot.)
   Having the form of liber, or resembling liber.

   {Libriform cells}, peculiar wood cells which are very slender
      and relatively thick-walled, and occasionally are
      furnished with bordered pits. --Goodale.