资料来源 : Webster's Revised Unabridged Dictionary (1913)

Red \Red\, a. [Compar. {Redder} (-d?r); superl. {Reddest}.] [OE.
   red, reed, AS. re['a]d, re['o]d; akin to OS. r[=o]d, OFries.
   r[=a]d, D. rood, G. roht, rot, OHG. r[=o]t, Dan. & Sw.
   r["o]d, Icel. rau[eth]r, rj[=o][eth]r, Goth. r['a]uds, W.
   rhudd, Armor. ruz, Ir. & Gael. ruadh, L. ruber, rufus, Gr.
   'eryqro`s, Skr. rudhira, rohita; cf. L. rutilus. [root]113.
   Cf. {Erysipelas}, {Rouge}, {Rubric}, {Ruby}, {Ruddy},
   {Russet}, {Rust}.]
   Of the color of blood, or of a tint resembling that color; of
   the hue of that part of the rainbow, or of the solar
   spectrum, which is furthest from the violet part. ``Fresh
   flowers, white and reede.'' --Chaucer.

         Your color, I warrant you, is as red as any rose.
                                                  --Shak.

   Note: Red is a general term, including many different shades
         or hues, as scarlet, crimson, vermilion, orange red,
         and the like.

   Note: Red is often used in the formation of self-explaining
         compounds; as, red-breasted, red-cheeked, red-faced,
         red-haired, red-headed, red-skinned, red-tailed,
         red-topped, red-whiskered, red-coasted.

   {Red admiral} (Zo["o]l.), a beautiful butterfly ({Vanessa
      Atalanta}) common in both Europe and America. The front
      wings are crossed by a broad orange red band. The larva
      feeds on nettles. Called also {Atlanta butterfly}, and
      {nettle butterfly}.

   {Red ant}. (Zo["o]l.)
   (a) A very small ant ({Myrmica molesta}) which often infests
       houses.
   (b) A larger reddish ant ({Formica sanquinea}), native of
       Europe and America. It is one of the slave-making
       species.

   {Red antimony} (Min.), kermesite. See {Kermes mineral}
   (b), under {Kermes}.

   {Red ash} (Bot.), an American tree ({Fraxinus pubescens}),
      smaller than the white ash, and less valuable for timber.
      --Cray.

   {Red bass}. (Zo["o]l.) See {Redfish}
   (d) .

   {Red bay} (Bot.), a tree ({Persea Caroliniensis}) having the
      heartwood red, found in swamps in the Southern United
      States.

   {Red beard} (Zo["o]l.), a bright red sponge ({Microciona
      prolifera}), common on oyster shells and stones. [Local,
      U.S.]

   {Red birch} (Bot.), a species of birch ({Betula nigra})
      having reddish brown bark, and compact, light-colored
      wood. --Gray.

   {Red blindness}. (Med.) See {Daltonism}.

   {Red book}, a book containing the names of all the persons in
      the service of the state. [Eng.]

   {Red book of the Exchequer}, an ancient record in which are
      registered the names of all that held lands per baroniam
      in the time of Henry II. --Brande & C.

   {Red brass}, an alloy containing eight parts of copper and
      three of zinc.

   {Red bug}. (Zo["o]l.)
   (a) A very small mite which in Florida attacks man, and
       produces great irritation by its bites.
   (b) A red hemipterous insect of the genus {Pyrrhocoris},
       especially the European species ({P. apterus}), which is
       bright scarlet and lives in clusters on tree trunks.
   (c) See {Cotton stainder}, under {Cotton}.

   {Red cedar}. (Bot.) An evergreen North American tree
      ({Juniperus Virginiana}) having a fragrant red-colored
      heartwood.
   (b) A tree of India and Australia ({Cedrela Toona}) having
       fragrant reddish wood; -- called also {toon tree} in
       India.

资料来源 : WordNet®

Betula nigra
     n : birch of swamps and river bottoms throughout the eastern
         United States having reddish-brown bark [syn: {black
         birch}, {river birch}, {red birch}]