The Collaborative International Dictionary of English v.0.48:

Sclerenchyma \Scle*ren"chy*ma\, n. [NL., from Gr. sklhro`s hard
   + -enchyma as in parenchyma.]
   1. (Bot.) Vegetable tissue composed of short cells with
      thickened or hardened walls, as in nutshells and the
      gritty parts of a pear. See Sclerotic.
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   Note: By recent German writers and their English translators,
         this term is used for liber cells. --Goodale.
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   2. (Zool.) The hard calcareous deposit in the tissues of
      Anthozoa, constituting the stony corals.
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The Collaborative International Dictionary of English v.0.48:

Liber \Li"ber\ (l[imac]"b[~e]r), n. [L. See Libel.] (Bot.)
   The inner bark of plants, lying next to the wood. It usually
   contains a large proportion of woody, fibrous cells, and is,
   therefore, the part from which the fiber of the plant is
   obtained, as that of hemp, etc.
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   Liber cells, elongated woody cells found in the liber.
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