Source : Webster's Revised Unabridged Dictionary (1913)

Crimson \Crim"son\ (kr?m"z'n), n. [OE. crimson, OF. crimoisin,
   F. cramoisi (cf. Sp. carmesi.) LL. carmesinus, fr. Ar.
   qermazi, fr. qermez crimson, kermes, fr. Skr. k?mija produced
   by a worm; k?mi worm or insect + jan to generate; akin to E.
   kin. CF. {Carmine}, {Kermes}.]
   A deep red color tinged with blue; also, red color in
   general.

         Theugh jour be as scarlet, they shall be as white as
         snow; though they be red like crimson, they shall be as
         wool.                                    --Is. i. 18.

         A maid jet rosed over with the virgin crimson of
         modesty.                                 --Shak.

Crimson \Crim"son\, a.
   Of a deep red color tinged with blue; deep red. ``A crimson
   tide.'' --Mrs. Hemans.

         The blushing poppy with a crimson hue.   --Prior.

Crimson \Crim"son\, v. t. [imp. & p. p. {Crimsoned} (-z'nd); p.
   pr. & vb. n. {Crimsoning}.]
   To dye with crimson or deep red; to redden.

         Signed in thy spoil and crimsoned in thy lethe. --Shak.

Crimson \Crim"son\, b. t.
   To become crimson; to blush.

         Ancient towers . . . beginning to crimson with the
         radiant luster of a cloudless July morning. --De
                                                  Quincey.

Source : WordNet®

crimson
     adj 1: having any of numerous bright or strong colors reminiscent
            of the color of blood or cherries or tomatoes or
            rubies [syn: {red}, {reddish}, {ruddy}, {blood-red}, {carmine},
             {cerise}, {cherry}, {cherry-red}, {ruby}, {ruby-red},
             {scarlet}]
     2: characterized by violence or bloodshed; "writes of crimson
        deeds and barbaric days"- Andrea Parke; "fann'd by
        Conquest's crimson wing"- Thomas Gray; "convulsed with red
        rage"- Hudson Strode [syn: {red}, {violent}]
     3: (especially of the face) reddened or suffused with or as if
        with blood from emotion or exertion; "crimson with fury";
        "turned red from exertion"; "with puffy reddened eyes";
        "red-faced and violent"; "flushed (or crimson) with
        embarrassment" [syn: {red}, {reddened}, {red-faced}, {flushed}]

crimson
     n : a deep and vivid red [syn: {ruby}, {deep red}]
     v : turn red, as if in embarrassment or shame; "The girl blushed
         when a young man whistled as she walked by" [syn: {blush},
          {flush}, {redden}]