libriform

from The Collaborative International Dictionary of English v.0.48

Libriform \Li"bri*form\ (l[imac]"br[i^]*f[^o]rm), a. [Liber +
   -form.] (Bot.)
   Having the form of liber, or resembling liber.
   [1913 Webster]

   {Libriform cells}, peculiar wood cells which are very slender
      and relatively thick-walled, and occasionally are
      furnished with bordered pits. --Goodale.
      [1913 Webster]