The Collaborative International Dictionary of English v.0.48:

Roe \Roe\, n. [For roan, OE. rowne, akin to G. rogen, OHG.
   rogan, Icel. hrogn, Dan. rogn, ravn, Sw. rom; of uncertain
   origin; cf. Gr. ??? pebble, Skr. ?arkar[=a] gravel.]
   1. (Zool.) The ova or spawn of fishes and amphibians,
      especially when still inclosed in the ovarian membranes.
      Sometimes applied, loosely, to the sperm and the testes of
      the male.
      [1913 Webster]

   2. A mottled appearance of light and shade in wood,
      especially in mahogany.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Roe \Roe\, n. [OE. ro, AS. r[=a]h; akin to D. ree, G. reh, Icel.
   r[=a], SW. r[*a].] (Zool.)
   (a) A roebuck. See Roebuck.
   (b) The female of any species of deer.
       [1913 Webster]

WordNet (r) 3.0 (2006):

roe
    n 1: fish eggs or egg-filled ovary; having a grainy texture
         [syn: roe, hard roe]
    2: eggs of female fish
    3: the egg mass or spawn of certain crustaceans such as the
       lobster
    4: the eggs or egg-laden ovary of a fish