The Collaborative International Dictionary of English v.0.48:

Honeycomb \Hon"ey*comb`\, n. [AS. hunigcamb. See Honey, and
   1st Comb.]
   1. A mass of hexagonal waxen cells, formed by bees, and used
      by them to hold their honey and their eggs.
      [1913 Webster]

   2. Any substance, as a easting of iron, a piece of worm-eaten
      wood, or of triple, etc., perforated with cells like a
      honeycomb.
      [1913 Webster]

   Honeycomb moth (Zool.), the wax moth.

   Honeycomb stomach. (Anat.) See Reticulum.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Reticulum \Re*tic"u*lum\, n.;pl. Reticula. [L. dim. of rete a
   net.] (Anat.)
   (a) The second stomach of ruminants, in which folds of the
       mucous membrane form hexagonal cells; -- also called the
       honeycomb stomach.
   (b) The neuroglia.
       [1913 Webster]