Source : Webster's Revised Unabridged Dictionary (1913)

Irish \I"rish\, a. [AS. ?risc, fr. ?ras the Irish. Cf. {Aryan},
   {Erse}.]
   Of or pertaining to Ireland or to its inhabitants; produced
   in Ireland.

   {Irish elk}. (Zo["o]l.) See under {Elk}.

   {Irish moss}.
   (a) (Bot.) Carrageen.
   (b) A preparation of the same made into a blanc mange.

   {Irish poplin}. See {Poplin}.

   {Irish potato}, the ordinary white potato, so called because
      it is a favorite article of food in Ireland.

   {Irish reef}, or {Irishman's reef} (Naut.), the head of a
      sail tied up.

   {Irish stew}, meat, potatoes, and onions, cut in small pieces
      and stewed.

Moss \Moss\, n. [OE. mos; akin to AS. me['o]s, D. mos, G. moos,
   OHG. mos, mios, Icel. mosi, Dan. mos, Sw. mossa, Russ. mokh',
   L. muscus. Cf. {Muscoid}.]
   1. (Bot.) A cryptogamous plant of a cellular structure, with
      distinct stem and simple leaves. The fruit is a small
      capsule usually opening by an apical lid, and so
      discharging the spores. There are many species,
      collectively termed Musci, growing on the earth, on rocks,
      and trunks of trees, etc., and a few in running water.

   Note: The term moss is also popularly applied to many other
         small cryptogamic plants, particularly lichens, species
         of which are called tree moss, rock moss, coral moss,
         etc. Fir moss and club moss are of the genus
         {Lycopodium}. See {Club moss}, under {Club}, and
         {Lycopodium}.

   2. A bog; a morass; a place containing peat; as, the mosses
      of the Scottish border.

   Note: Moss is used with participles in the composition of
         words which need no special explanation; as,
         moss-capped, moss-clad, moss-covered, moss-grown, etc.

   {Black moss}. See under {Black}, and {Tillandsia}.

   {Bog moss}. See {Sphagnum}.

   {Feather moss}, any moss branched in a feathery manner, esp.
      several species of the genus {Hypnum}.

   {Florida moss}, {Long moss}, or {Spanish moss}. See
      {Tillandsia}.

   {Iceland moss}, a lichen. See {Iceland Moss}.

   {Irish moss}, a seaweed. See {Carrageen}.

   {Moss agate} (Min.), a variety of agate, containing brown,
      black, or green mosslike or dendritic markings, due in
      part to oxide of manganese. Called also {Mocha stone}.

   {Moss animal} (Zo["o]l.), a bryozoan.

   {Moss berry} (Bot.), the small cranberry ({Vaccinium
      Oxycoccus}).

   {Moss campion} (Bot.), a kind of mosslike catchfly ({Silene
      acaulis}), with mostly purplish flowers, found on the
      highest mountains of Europe and America, and within the
      Arctic circle.

   {Moss land}, land produced accumulation of aquatic plants,
      forming peat bogs of more or less consistency, as the
      water is grained off or retained in its pores.

   {Moss pink} (Bot.), a plant of the genus {Phlox} ({P.
      subulata}), growing in patches on dry rocky hills in the
      Middle United States, and often cultivated for its
      handsome flowers. --Gray.

   {Moss rose} (Bot.), a variety of rose having a mosslike
      growth on the stalk and calyx. It is said to be derived
      from the Provence rose.

   {Moss rush} (Bot.), a rush of the genus {Juncus} ({J.
      squarrosus}).

   {Scale moss}. See {Hepatica}.

Carrageen \Car"ra*geen`\, Carrigeen \Car"ri*geen`\, n.
   A small, purplish, branching, cartilaginous seaweed
   ({Chondrus crispus}), which, when bleached, is the {Irish
   moss} of commerce. [Also written {carragheen}, {carageen}.]

Source : WordNet®

Irish moss
     n : dark purple edible seaweed of the Atlantic coasts of Europe
         and North America [syn: {carrageen}, {carageen}, {carragheen},
          {Chondrus crispus}]